It seems that so much of what we consider modern masculinity is centered around how attractive women find us. How many attractive women we are able to bed. The most masculine men sleep with a lot of women. In the older times, when sexual norms were much more conservative, we saw that the men perceived as most masculine were not necessarily the most sexually active.

Ironically, feminists tend to complain incessantly that masculinity tends to objectify and devalue women by turning them into little more than notches on a bed post. But, the move of our culture towards gynocentrism seems to be a big part of this. We don't offer men outlets to be seen and defined as "masculine" in ways separate from women. The cynical side of me would say that feminists and women in general don't really want this to change as it takes away their power in determining masculinity.