Cognitive dissonance and the lack of awareness around it are the only answer I can come up with. Sexual chemistry can be formed through communication, you can still "show the goods" early if you want to if you are afraid of body image. But any form of sex oral/vaginal/anal etc should be off the table for at least 3 months. Why would anyone who wants a serious partner, in the long run, disagree with this?

Kissing/Making out/Groping/Handholding everything that isn’t SEX is all fine