I believe that the real problem is that what would you feel if your spouse is insisting to have friends from opposite sex :). You may believe that man and woman can be friends but it makes you start to think again if your spouse makes new friends from a cafe,restaurant or sth like that, not only from work/school etc. ;) Sure if someone from opposite sex comes beside you and tries to find a subject (mostly stupid one) to start a chat with you, there is not only one thing in his/her mind which is just being friends. Sure he/she expecting more from you :)

Everyman dies; but not every men really lives.