In fact, however, marriage (and other monogamous relationships) are quite common, so the distribution is not really much like that.

And even though it was claimed that liberals don't have a problem with some males getting an unfair amount of the relationship-hours, it seems that liberals really strongly dislike PUAs. There are a number of reasons for this, but in many cases, the underlying reason is probably actually a fairness concern (in the "why don't I get any?" sense, rather than the abstract sense). And if PUAs are correct that nonconsensual touching is a competitive advantage, then indeed liberals are consistent in that they attempt to regulate this.

Finally, as noted, liberals tend to oppose traditional polygyny, which is another case of uneven distribution.