I'm all for H-scenes until they're actually happening. Then it's just 'ugh, I can't wait for this irritating fuckfest to be over so I can actually continue with things.' Annoyingly though, I like the idea of 'couple-based' H-scenes (like, two people forming a relationship) because sometimes the sentiment behind it's really nice, so I don't turn H-scenes off in case they're actually relevant.
That said, any H-scene which goes mouth/vagina/bum (or anything in that order...) in one go is either gratuitous and annoying, or so hilariously bad that the very idea of popping a cock-rocket is impossible.