A large behind was associated with being fast? I think I sort of get this from a white Catholic schoolgirl growing up in the 70s and 80s perspective. I sprouted boobs in third grade. They continued to - er - flower. The nuns were not amused. My mom was not amused. It was assumed because I had a nice set of tatas from 8 years old onward, that I was not only gonna be a big old slut, but probably already was. My mom spent a lot of time threatening me about going too far with boys even when boys were the farthest things from my mind. The nuns spent a lot of time giving me disapproving looks.
It was a whole thing. For instance, when I was 15 or 16 (and still a virgin), I was in a department with my mom clothes shopping during a sale - so it was super crowded. Suddenly, apropos of nothing, my mom looked at me and said at the top of her lungs, "I sure hope you're on the pill!" I wanted to die I was so embarrassed. She also used to always worry I was going to "go into the bushes with boys." Yeah - because that's where I'd choose to have all of my sexual experiences - in itchy old bushes with bugs everywhere.
And so, as I got into my teen years and started to explore physical intimacy in the way a lot of teen girls in the 70s and 80s did, I definitely had to balance out all of these messages I'd received from all of the disapproving adult females in my life. It was a struggle for a while. It's tough stuff for an 8-year-old girl not even thinking about sex to fathom, and the longer it goes on and the more influential people in your lives that feed you those messages, the more you internalize them. And certainly as a Catholic school girl, I also struggled with shame about not only my body changing, but also with my growing interest in physical intimacy. But then I had sex, realized it was awesome, and I got over it...
I suspect Iris equates virgin with "good girl". And so she wants everyone to see and know she is "good" because she is a virgin. She's still trying to live up to the social strictures under which she was raised. For some reason, she hasn't made the leap to, "I'm an adult and I can do any damn thing I please with my body" yet.
Oh also - my mom also told me that only prostitutes and gypsies get their ears pierced. I responded by getting mine pierced about eight times, as well as getting my nose pierced. My husband tells me I am "demand resistant."