>>220196
Considering the female to male ratio in equestria, outlawing male on male relationships and sexuality is only logical.
We have to ensure the few stallions around produce enough foals to ensure the pony species doesn't die out.
Female on female relationships are perfectly legal though and outright encouraged by your benign princess as the number of females who end up childless is doesn't affect the overall number of foals in each generation nearly as much as male on male relationships.
Its a simple matter of biology really.
Also, more percent of lesbian ponies will choose to bear foals than gay stallions.
So yes. Gay males are against the law.