being homosexual is an anomaly, and it is not intended naturally.
naturally humans aren't even supposed to use contraceptives, and the only reason sex is pleasurable is because if it wasn't we wouldn't reproduce and the species would die.
It's the subconsciousness's way of rewarding us for our accomplishments for the species., reproduction being one of the most important ones.
The reason sugar tastes sweet/good is because glucose is very important for our existence, and finding it wasn't that easy for a time, so we were "rewarded" and also had a reasons to "search "for it .
It's a pity such capable brains end in such tedious ways.