A narcissistic womanizer finds the tables turned when a curse makes him irresistible to men. And the only cure may be consummating a gay marriage.

You could take a story like this many places. For me the first sentence worked fine as a logline by itself. Any more is only needed if you are trying to make a particular point ... and that risks narrowing the audience scope.

I thought it was pretty clear the curse is the inciting incident

It seems to me that for the premise to work it has to be the case that he suddenly becomes attractive to gay men AND concurrently repulses all women. He's lost his hetero-seductive mojo, he can't get laid. Women are rejecting him and gay men are hitting on him.