>>I think there are actual physical and chemical changes which occur after prolonged homosexual activities.
They don’t “evolve” to having self-lubricating colons.
And self-administered hormones don’t count as “chemical changes”.
EEWWWWWWW
Nasty.
But behavior does effect brain chemistry, this is true ranging from narcotic use, to sexual activities, to just plain prolonged anger or sadness. The brain is stimulated in various ways by various activities, and people do associate activities with feelings.