I have been debating this with a friend. A male acquaintance of mine is single, has been for some years and has had a large number of casual relationships. Provided as we have no reason to believe otherwise these are all consensual, and that precautions are taken re STIs etc AIBU in arguing that this in itself does not indicate a character fault? It is fair to say the person in question is not especially forward not boastful. She reckons he can't be right, I don't think that is necessarily the case. Am not in any way interested romantically myself fwiw.