You SHOULD share it and show pics like this more often, absolutely !!
In the past I have tried my own cum, after facializing a girl I just started kissing her and yeah, that was amazingly hot !!!
As for sharing another man's cum ... depends on the situation I guess. But I don't think I would mind licking a pussy after a nice creampie. I ve done it with Alex sometimes. After cumming inside her I have started licking her to help her orgasm and that wasn't bad either. I think I would also like seeing her with another man's cum on her face, while I fuck her. Kissing would certainly not be a problem !!
As for women sharing cum, well .... I think it's obvious I don't need to answer that !!
Am I too perverted ?