I think men can have friends of the opposite sex, for example, they can become friends with girls' girlfriends, so that they can know more about their preferences and make suggestions together to surprise their girlfriends when proposing marriage. There will definitely be female colleagues at work, and there is nothing wrong with making friends, mainly because men can control themselves well. Responsible men don't cheat because they have heterosexual friends, and irresponsible men may cheat even if they don't have heterosexual friends. Everything can't be killed with a stick, and the right friends will play a great role in life. Therefore, girls should keep their eyes open when looking for men. If he is ambiguous about every friend of the opposite sex, then such a man must not bring it. If he respects every friend of the opposite sex and has no deviant behavior, he can consider choosing.