For the girls I've known, jillin' has little to do with whether they are having sex with boyfriends (or girlfriends) or are alone. Perhaps I just attract masturbation fiends
, but I've been with several girls (of all sizes) who are jillin' every chance they get, and also having plenty of other sex. In fact, sometimes good sex increases MY appetite for masturbation, and it has for some girls I know, too. I know one girl that usually masturbates before a date, kind of priming the pump!
I do think there are relationships when other sex isn't so satisfying , and masturbation fills in. I kinda think this happens with girls more than boys, when bf's are selfish or not very good lovers. I know a married woman who jills every day and rarely has sex with her hubby. Of course, now that I think of it, I know a married woman who jills every day and has frequent sex with her hubby, too!
It does happen with guys. I've often masturbated back in my bed after having sex on a date, and if I had good sex I probably feel horny in the morning, too. A friend in college used to come by my place after dates to jo with me, even after having sex with his gf, because he got off better with his hand. (Ok, to tell the truth, he got off better with my hand sometimes, too).
Big or thin? I don't think it matters. Thin girls fit the stereotype of being attractive; a lot of guys really like to have sex with BBW. (Kinda like, would you rather sleep on a futon or a feather bed?) Personality matters, once you've been introduced, and I've never been able to see a "type" that masturbates.
I've tried to guess, and I've been surprised (pleasantly or not) a whole lot. I was chatting (and masturbating) with a girl last night who started at age 5 and orgasmed at seven. She and her girlfriend rubbed clitties very young when she had a B-cup and her friend was flat; she's now a D-cup. (Maybe you could call her a big girl, though it's her natural size). Anyway, she was getting off well before she was EITHER big or thin!
I regularly masturbate with a grammar school principal, who first humped a pillow when she was ten--never would have imagined! Go figure. And I've met some hotties who never touch themselves. One girl I know jills twice a day, and her sister has never even tried it. So I guess you could say two things: (1) beauty is only skin deep, and (2) you just never know where someone's fingers have been!