Have you ever kissed a man?

[Mayo]

I have had male lovers who would do everything BUT kiss. Why is that so outside the lines?

If you kiss another guy, it's gay. And conventional (hetero) masculinity, as constructed, cannot tolerate certain deviations from its narrow strictures. Like men wearing dresses...

IMO it's a legacy of medieval Catholic morality, modified by conservative Protestant groups such as the Puritans, Lutherans, etc., re-interpreted by the Victorians, influenced by the fundamentalist movements of the 19th century USA, and given its modern form during the post-WWII/Cold War years.