Even if "be fruitful and multiply" is meant as a duty for every single person, then this would not make the act of homosexual intercouse itself bad unless engaged in exclusively.
Anyway, it makes more sense to me to view that as a command to all mankind, because nature itself precludes some from obeying it, whether though poverty or infertility or even an asexual or homosexual sexual orientation (if they exist). Despite some individuals being unable to obey the command, humankind would nevertheless continue to be fruitful and multiply.
I'm well aware that "be fruitful and multiply" is not the only relevant scripture; I figured I'd address what you said. Anyway, scripture doesn't relate much to the topic of this thread. Plus, it won't convince anyone who doesn't believe.
I didn't mean to say scripture isn't relevant to the topic.. I meant to say it wasn't relevant to the question of whether homosexual patterns in lesser animals is pertinent to homosexual patterns in humans.
That's just it though, isn't it? Gays and lesbians do practice homosexual intercourse exclusively.
One can also go to creation, as Jesus did when asked about divorce, to show it is a member of the opposite sex which properly fulfills human sexual desire.
Best though, and I really can't understand why more don't use it, are the specific commands of Lev. 19, commonly called the "holiness code." This passage is a mixture of Jewish religious purity laws (which Christ and the Church clearly abrogated...as has been known and taught since the first generation of Christians) along with moral laws...still in effect today.
Sex between men and men, (which would also include sex between women and women, in the Hebrew understanding) men and animals, and all the various forms of incest are described as an abomination. The language indicates these are the most disgusting and despicable kinds of sins....and Hebrew Civil code (also abrogated by Christ) demanded the death penalty for them.
Various forms of the condemned sexual acts have been accepted and practiced all over the world in pagan societies...only in the Judeo/Christian world, with the acceptance of the Bible, have incest, beastiality, and yes homosexuality been uniformly condemned.
A question to ask Schori and her fans is whether they believe there can be loving consensual monogamous sexual relations between blood family members, or between humans and their pets? If you throw out Lev. 19 as the authority to call homosexual acts moral perversion, you also throw out its authority in calling incest and beastiality moral perversions.
And yes, Jesus is never mentioned to have commented about incest or beastiality...so it must be fine, right? (please forgive the nausea there)