What intrigues me about this world is that all of them complained that the sex is bad. They were cumming for the first time in their lives with MC, the French kissing seemed like a new deal to them. So like not only MC gone to world where big tits girls are seen as low rank/low quality, the other guys are so bad at sex, even your typical beta MC would be a gigolo there. And then MC got skills to last long in bed, have a big dick, and that big dick not hurting girls. I mean go to world with OP cheat skills is one thing, but this dude just won like OPness lottery if you ask me.
Just reverse the tits size chart so that small breasts are seen lame and isekai me there and I would die happily to get there without any hesitation