So Tapas has kind of separated the app version from the website version. The website is less strict about NSFW, but there’s less visibility to your comic; so that’d be like no showing outright penetration, but things can be sexy on screen. Butts and titties out!
The app is increasingly strict because of Apple, no nudity, no butts, no pubic hair (including the happy trail from the belly button, which is weird). You gotta keep it either very censored or very subtle on the app.
One option people use is to have things censored on the app, but link to a patreon or less strict hosting site that is not censored.