Although if you think about it, and ever saw hentai where a female character gets "consensually fucked" for god knows how long and wonder "...does she actually enjoy that? Doesn't it get gross and painful after a while?" you'd start to wonder about those things too.
Depends...some people like messy stuff (getting cum on over and over again), in my case after a while, we clean ourselves and go again. Where i live we have sex for 30 min to one hour (or in some special dates even more), but like i said, depends the place and even at the place, some people do different times. I never have problem with "pain" after, one of my girlfriends have pain once, but was a wild night.
Ironically, this game was one the first ones that i really liked because the mc can go on, 99% of them is just "after the orgasm the sex end here", i know that this is mostly a cultural thing, and every place is different, but i really like the way that sex is treated in this game, in my opinion the dev made a great job in both of his games, the only thing that i can say that i wish there is more is cuddles...