Thank you for your feedback!I assure you that this behavior is not typical for the game. In many playthroughs I've seen many times girls get corrupted far past 30 with A/T/V virginities. And to consider a girl complete incorruptible virgin if she just doing BJs is very doubtful. And it also kinda counterproductive for the game because it prohibits from starting sex with anal (AFAIK girl need high corruption to loose anal virginity to well hung MC)
You are correct, it isn't typical for the game and was added in a recent patch. I understand what you are saying but feel that the current solution is more realistic overall. Few start off their sex lives by going straight to anal without doing deepthroat or vaginal sex first. The sex system is generous and it is easily obtainable to take all three of of girl's virginities in a single sex session.
It is possible to go straight to anal if the girl is very drunk or drunk with an aphrodisiac. This console command will make a girl open to just about anything during sex:
no_boring=1 & aphrodisiac=1 & drunk=4 & helpless=1
I'll leave it up to the community. If the consensus is for me to remove the corruption restriction then I'll remove it.