When I was with my previous employer, where I mostly worked with biologists and researchers, one of the senior biologist had a talk about animals behavior in the wild. Somehow, when we classify man as a mammal, we do see a few similarities, which was widely debated regarding Darwin's theory. To cut a long story short, men or males, if we set aside religion and accepted human behavior, are made to mate or multiply as many as we can. One of the theories is why do a male sex organ is visible outside his body compared to a female's sex organ which is hidden. When males mate with females, the male organ expands or lengthens which is a way to ensure that sperm cells will penetrate the female organ and will survive even inside the female's body. Thus the bigger and the longer male organ, the better he can mate or multiply and assure offspring. The male organ is located outside the body for females to see which male is best for them to assure offspring.
The congratulatory actions males do when men have sexual concepts is an act that is natural for men since biologically speaking, males must have more conquests to be able to multiply more. Males compete for females which we sometimes hear that males often name men who are superior as alpha males. If we see it without religion, proper behavior, proper upbringing, it is the logical explanation why men act this way.
Society is now more advanced compared to early times where people are taught proper behavior so that men and women are treated fairly. I do agree that men should always treat women fairly and act properly in the presence of the opposite sex but we also have to understand our origins in life biologically.

Considerably over the years, I think that attitude has diminished. Especially with all the new strains of STD, HIV and the AIDS virus.

Women who expressed the same behavior were considered 'whores', yet men were considered 'studs' and 'macho'. You also see more of that role reversed with women being praised and congratulated for being 'cougars.'

In my opinion, back in the day when the 'boys will be boys' mentality existed, there were less men who were openly gay -it's just a sign of the times. I think that the gay movement has changed the acceptable promiscuous behavior attitudes that we see today. Promiscuous men were considered to be virile which was a sign of strength and masculinity. I think those attitudes have changed.