I'm not saying that nobody figures out how to make it happen, or how to get both people to enjoy it. I'm saying it delays the progressive exposure to getting people more comfortable with getting physical. This can be a problem when at least one of the two are frigid, it seems to reinforce that. Again, I'm willing to accept science that contradicts what I said. Babies born in other cultures where kissing was taboo and marriages were arranged and women were expected to have children both as validation and as a duty, and where their consent was less valued is not an indicator that most couples easily and readily made that leap back then, and it's certainly not a scientific observation of couples in our culture today.