Will Smith Admitting To Sexual Fantasies of Other Women

According to a local source, these exact words came from Will Smith, ” says he and his wife of seven years, actress Jada Pinkett, have made a pact that they can sleep with other people, as long as it isn’t behind each others back.”

Is that an interesting phrase or what.? Would yu make that kiinda vowel to yur wife/husband that its ok to sleep with other people as long as yur open an honest about it?