.... Man reincarnates into world as a female, takes entire seasons to pass by till he realized how bad not having underwear is, and subsequently fucks himself for 6 days straight.... Seems legit.
Just saying if he saw some of the games Japanese made, he would have realized way sooner how perverted engineering can really be, I mean look at Earth Defense Force, they have a mech that has a gun on its crotch. But I digress, that guy is more of a pervert than I would be. I would at least make the underwear before hunting for months without realizing the issue... I wonder how long it will take for him to think about tentacle toys