As far as I interpret things, I know it's wrong (as a christian) to question the validity of scriptures but from an anthropological perspective it makes sense that during the times of the old covenant, people were way more strict about anything regarding sexuality. During such ancient times, people were at the mercy of the elements, the harshness of arid deserts and purely manual labour under exceedingly harsh conditions and survival of clans and other forms of social structures relied on numbers. Sure, the more people you have, the more mouths you've got to feed but at the same time, the more people that can work on agriculture and who can make new people that'll help sustain the population.
Therefore, given that natality was such an important factor and resource for collective survival, it was then of course understandable that they wouldn't like people to engage in sexual acts that would otherwise be non reproductive as it'll be "a waste of time and resources" and also a potential distraction. Not to mention that sexual fulfillment has a heavy weight on the human psyche and therefore is an important element to be controlled by the hierarchies that lead various societies.
As such, it's no wonder that people from such eras would condemn and repudiate "sexually immoral acts" as they do not produce offspring, but we have since moved on from that. We've found ways to use what we've learned from nature to make new things to help make our lives easier and have slowly developed more advanced critical thinking skills, compassion and empathy and we have reached a deeper understanding of our nature as emotional creatures. We're beings of creation and we're the ones God inherited his creation to.
God is good, and so is his creation and all the creatures in it, ourselves included. Sure, we may have been kicked out of Eden due to the fact we commited the great sin of disobedience, but we can be redeemed by following the example of God. He came down to earth in the form of his son to both defeat death and to also forgive us all for our sins and the sins of everyone. We're naturally driven by temptation and ignorance, but we can learn and we can be better.
We're just arrogant creatures who make a lot of mistakes. In the nature that formed in such an amazing and complex universe ruled by the laws of our good natured and all loving creator, many creatures engage in all forms of sexual behaviours, from oral to anal to interspecies, masturbation, and so on yet our arrogance leads us to ignore plenty of what we see and betray ourselves by making a false sense of superiority. We do not know how animals truly think. They may as well think and feel in much the same ways we do, because we're all part of the same creation but we may just express it differently. If animals can show receptivity and make genuine emotional bonds with each other, ourselves included, maybe it's just part of it and we shouldn't feel like we're doing something wrong or abhorrent when we're just doing what we can do because nature allows us to.
After all, as long as we don't genuinely hurt each other, we can help each other and there's tons and tons of ways to do that and it all leads to good. If a new covenant could be established to free us from the old one, maybe it's time we think about it more in depth, and thank God for letting us love each of us equally beautiful and different creatures of this amazing universe in which we live.
