World of infidelity

The topic of Tiger Woods has been a popular topic for discussion among the female collegues these days. If he has an ex-model wife, why the need to look for other women? And not just one woman, but ten, and still counting. It could be because the women are throwing themselves at him since he is wealthy. Or his wife and him are already not having a good relationship enough. Or Tiger himself is actually quite a unfaithful man.
Well, firstly, I don't find him attractive. Yes, perhaps his wealth is attractive. It can give a woman whatever she wants.
Maybe he has a glib tongue and can sweet-talk women. But then, it brings another question, so why does he picks some not so good-looking girls? You would think, he should have better taste in women. So maybe, it could be a chemistry thing. Or these women are able to satisfy his lacking and needs (other than physical fantasies?).
Whichever the case, can I accept my man to be unfaithful to me? The idea of sharing a man with another woman irks me, especially in terms of sexual relationship. The sex is supposed to be unique to two people, so how is it possible to be shared? Or, thinking, some other woman shares the same experience ( in a way)...
But sometimes I feel that when the man strays, it could possibly be a result of a weakening in the husband-wife relationship. The wife has a role to play.