[Loved one]

My ex girlfriends were manic depressive and it seems that way, but I am not sure.

[Domanic]

Yes. You are talking about bi-polar disorder, then when the sufferer is on a 'high', they can become a nymphomaniac (or the male equivalent if the sufferer is male).

Not all manic depressives behave like this on their 'highs', but it is so very common. Don't blame her, it is not her fault. She's suffering with an illness. The main thing is that she's practicing safe sex so she's not hurting herself further, or hurting others.

[Undoubtful Dignity]

Yes, they are very nympho. They have to take medication. They are also suicidal. Some of them are anyway.

[jafman2000]

This behavior is not exclusive to females with Bipolar. They are not so much nymphomaniacs, but more uninhibited and promiscuous risk takers.

[noel1426]

Yes, frequently. Being "hyper sexual" is a part of mania.