I'm a lady, whether I'm in a relationship or not I have guys hitting on me almost every single day, their my friends, ex's, strangers, bosses, co-works, my boyfriends brother, dad, friends and as many women. So guys don't think for one minute you're wife/gf is not getting attention from other potential lovers, because she is. From what I've read a very large percentage (almost all) women will at some point in time cheat on their husband/boyfriend more than once, not only with guys, but yes with girls as well.
P.S. Once a girl has had a big penis I side her, she will forever crave it again and again, on the other hand if she hasen't had a big penis yet she will be curious until she does.