Before Christians start thumping the Bible to justify hate for homosexuality, keep in mind that the Bible also condemns those who masturbate. Unless you are masturbation free, based on the standards of the Bible, you are no better off than the homosexuals and other "sinners" described in the Bible.

So if you masturbate then biblically you're on the same moral level as homosexuals or non-believers and have no right to cast stones at others.

Not Just "the Bible"; rather, God, speaking through His Prophets in the Bible, AND Jesus, speaking to all, in the Bible. God, and His Son - the only Being who could state, with Authority, what God believed - sharing an identical condemnation of masturbation and lust.

Death for Spilling Seed

Genesis 38:9-10
"And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother’s wife, that he spilled it on the ground, lest that he should give seed to his brother. And the thing which he did displeased the LORD: wherefore he slew him also."

Some mistakenly argue this is not a condemnation of masturbation. Wrong. See: http://www.rtforum.org/lt/lt67.html

Dictionary Definition of Onanism:
o·nan·ism
1. Masturbation.
2. Coitus interruptus.

[After Onan, son of Judah (Genesis 38:9).]

Source: The American Heritage® Dictionary of the English Language

Spilling Seed Makes You Unclean

Leviticus 15:16-17
"And if any man’s seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even. And every garment, and every skin, whereon is the seed of copulation, shall be washed with water, and be unclean until the even."

Catholic Church Condemns Masturbation

The Catechism of the Catholic Church (1994 pp. 564-566) lists six "Offenses against chastity": lust, masturbation, fornication, pornography, prostitution, and rape.

"2352 By masturbation is to be understood the deliberate stimulation of the genital organs in order to derive sexual pleasure. "Both the Magisterium of the Church, in the course of a constant tradition, and the moral sense of the faithful have been in no doubt and have firmly maintained that masturbation is an intrinsically and gravely disordered action."[137] "The deliberate use of the sexual faculty, for whatever reason, outside of marriage is essentially contrary to its purpose." For here sexual pleasure is sought outside of "the sexual relationship which is demanded by the moral order and in which the total meaning of mutual self-giving and human procreation in the context of true love is achieved."[138]

To form an equitable judgment about the subjects' moral responsibility and to guide pastoral action, one must take into account the affective immaturity, force of acquired habit, conditions of anxiety, or other psychological or social factors that lessen or even extenuate moral culpability.
- Catechism of the Catholic Church, para. 2352

Good Christians Everywhere Condemn Masturbation

http://www.goodmorals.org/sterile.html

Mormon Church Leaders, Whom some Christians Praise as "Ahead of the Curve" on Homosexuality, Have Also Condemned Masturbation

“Masturbation is not approved of the Lord nor of his church, regardless of what may be said by others whose ‘norms’ are lower.”
- Current Aaronic Priesthood Manual, Lesson 25: Personal Purity through Self-discipline, page 91

"Prophets anciently and today condemn masturbation. It induces feelings of guilt and shame. It is detrimental to spirituality. It indicates slavery to the flesh, not that mastery of it and the growth toward godhood which is the object of our mortal life. No young man should be called on a mission who is not free from this practice.”
- Current Family Home Evening Resource Manual, Quoting Prophet Spencer W. Kimball, "Teaching about Procreation and Chastity, page 253

Jesus and the Apostles Condemn Lusting After Women (which includes masturbation)

Matthew 5:27-29
"Ye have heard that it was said by them of old time, Thou shalt not commit adultery: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart. And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell."

Proverbs 6:25
"Lust not after her beauty in thine heart; neither let her take thee with her eyelids."

2 Corinthians 7:1: "Let us cleanse ourselves of all filthiness of the flesh."

Ephesians 5:3
"But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;"

1 Theselonians 4:2-8
"For ye know what commandments we gave you by the Lord Jesus. For this is the will of God, even your sanctification, that ye should abstain from fornication: That every one of you should know how to possess his vessel in sanctification and honour; Not in the lust of concupiscence, even as the Gentiles which know not God:

2 Timothy 21-22
"If a man therefore purge himself from these, he shall be a a vessel unto honour, sanctified, and meet for the master’s use, and prepared unto every good work. Flee also youthful lusts..."

1 Peter 2:11
"Dearly beloved, I beseech you as strangers and pilgrims, abstain from fleshly lusts, which war against the soul;"

1 John 2:16-17
"For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever."

1 Peter 4:1-2
"FORASMUCH then as Christ hath suffered for us in the flesh, arm yourselves likewise with the same mind: for he that hath suffered in the flesh hath ceased from sin; That he no longer should live the rest of his time in the flesh to the lusts of men, but to the will of God."

1 Corinthians 6:9
"Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind"

Galatians 5:16-17
16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other..."

Colossians 3:5-6
"Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry: For which things’ sake the wrath of God cometh on the children of disobedience"

Self-proclaimed Christian demagogues who masturbate or lust after women are no better off biblically than others they condemn using the Bible.