Because you are not the only one on the planet...
And you are not the only one who wants to go to Eden. Ask one of those starved babies if they would like to go and I am sure they would say, ‘yes', anything to get out this disgusting place.
Besides even if you should decide to ‘fornicate' and go to Eden yourself (you know, and f--k everyone else) well you won't be staying for long, because you are getting older and older, and less and less attractive to all those other people like yourself, who are also deciding to ‘fornicate' in Eden (and f--k everyone else). And you are dying, too, but all those other people who died in the past, if they lived a long life, didn't spend much time in Eden either. (They were too old for Eden. And who knows maybe during that time of their life they made some of their best contributions to humanity, having more time to think about someone else and show some responsibility).
So in brief then, to summarize, you want to bother yourself with that foreign sounding concept ‘sexual morality' because you do want to run naked through the Garden of Eden forever and ever, don't you, and the Kingdom of Eden is a lovers paradise, where all the great lovers of humanity will spend forever loving the human beings so they love to love. (Getting healed, and being ‘born again' - to steal a phrase from those churches - and becoming that kind of warm caring moral ethical able to love type of person that Yahweh wants in Eden would be a good thing to concern yourself with right now.)