Writer's Block: Are women or men bigger cheats?

Do you think men or women are more likely to cheat if they know they won't get caught? Do you believe in marriage?
I believe that men are more likely to cheat if they know they won't get caught, but I believe that women are more likely to form actual relationships with other people that lead to sexual behaviour.

And essentially, despite what the statistics say and disregarding my own experiences, I do believe in marriage as a concept. Though I don't believe that there needs to be a ceremony and the huge hoopla of an actual marriage. I like the idea of only being with one person and sharing your lives together....Nevermind what I might say or what my attitudes to relationships in general might be.