I have a friend who was married to a girl who was always bringing male friends home. He had no problem with it whatsoever. Of course, eventually she started cheating with one of them and filed for divorce.
Women will shame men who object to their male friends by calling them jealous, controlling, and insecure. And hey, who wants to be those things? But those are simply tactics they use in order to get their way, so they can do whatever they want. Because society has brainwashed them into thinking nothing they do is wrong. Unfortunately, many men will also use this shaming tactic and call men insecure if they are not totally on board with their women spending time with other males. But, as has been explained, there are very good reasons for not being okay with this.