I'm no stranger to NSFW, and my series that has/will have it is Heavy Horns. I won't get too explicit in it, since it still has to abide by Tap's rules, so I'll probably save the juicy stuff for Patreon supporters. And the tag will be for sex, because I like drawing that more than gore, lol.
I wouldn't say NSFW is less popular, just not as accessible. I mean, look at the explosion of BL on all comic platform sites. There are some thirsty people out there, and here I am providing another beverage. xD If anything, I think there's a high demand for it.
I decided to venture into male x male romances because the ones I've read were all pretty shitty, save for a few shining exceptions. Plus I like drawing guys and I think I'm pretty good at it.