sperm were never meant to end up in a kleenex tissue, so by that definition, masturbation is abnormal, which means 99.9% of all men have abnormal behavior.
makes perfect sense.
Interesting point, wanted to think on it awhile before responding.
I think the difference is that masturbation doesn't interfere with the ultimate goal of procreation. It is a passtime that anyone of any sexual inclination can engage in, without subverting or negating the ability to procreate. Hard core Catholics can disagree, but every sperm is most definitely NOT sacred.
I don't think you really want to compare homosexuality with masturbation as it could lead to the argument that it is merely a sexual fetish and not a variation that a person is born with. That is the argument to which most of the religious zealots would subscribe, I for one don't agree.
If a majority of homosexuals eventually mated with the opposite sex, then homosexuality could be relegated to the same category as masturbation, a passtime. That certainly doesn't seem to be the case, so I think it does interfere with nature's pursuance of procreation in the individuals for whom it is a reality.
Not a good or bad thing, but certainly against the WILL OF GOD ALMIGHTY (kidding).