Well, it's not exactly "on their own" but...
1) When my ex-girlfriends and friends with benefits have sent me videos of them masturbating; in most of them, they touch and caressed their nipples and; in some, they sucked them on their own.
They seemed to enjoy it a lot; and of course, I didn't tell the to do it, so I am going to assume that they do in fact like to do that while alone.
2) When I've masturbated in company of a girl (gf, ex-gf, friend, etc); they do the same. I repeat: I don't ask them to do it; it just happens.
The only reason to doubt that they like to suck or touch their nipples on their own and while alone would be that they know that we find it exciting, so they do it only to please us. But honestly, I don't think so. My educated guess is that they truly love to do it whenever they are excited.
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