I believe -- anyone feel free to correct me, as these are not my predelictions -- that the allure is possibly in the projected "fresh innocence" and that a man would feel that his masculinity and control was unquestionable. An inexperienced young girl (or boy) has no, or limited, basis for comparison. I'll admit to being attracted to girls who are as young as my daughter (who is 25) but there is a difference, I feel, in being aroused by someone of a pre-sexual age and being attracted to a young firm, healthy physique. I don't get it, personally. I think it's an immature and insecure impulse.