tuesday firstly your words 'beneficial for populations of animals' is a large exageration they have found a few cases in the animal kingdom and use these as examples but also there is the element of humans anthromorphising animal behaviour sexually take the following.
Is dogs sniffing each other bums sexual behaviour? No! Unless an action directly involves a complete sexual act things like grooming and suchlike behaviour between animals samesex or otherwise could be us sexualising what is just social behaviour between animals. Humans tend to mark certain body areas as purely sexual in context and any contact with them as sexual but animals do not reason like that so smelling a bum would have no sexual meaning for them.
the point has been made that man is held to a higher standard than animals by God and so animals cannot be used as an excuse no-one has shown a credible alternative to this point.
the bible as I said above is very clear that the only sexual contact God approves of is between a man and his wife and people try to blur this by taking individual scriptures out of biblical context but this is a complete bible truth.
this theme runs through both the hebrew scriptures and the greek scriptures. Jesus completely followed the husband has one wife viewpoint.
So i'm not sure why you think trying to make a point that the hebrew scriptures are obsolete is relevent even if it was true WHICH IT ISN't. Jesus fulfilled the law and so many parts we didn't have to follow but we still very much had to keep our standards if anything Jesus was strictor since it was principle.
Matthew 5:27-29 (New International Version)
27 "You have heard that it was said, 'Do not commit adultery.' [a] 28 But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. 29 If your right eye causes you to sin, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell.
Romans 6:15-16 (New International Version)
15 What then? Shall we sin because we are not under law but under grace? By no means! 16 Don't you know that when you offer yourselves to someone to obey him as slaves, you are slaves to the one whom you obey—whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness?