So many cats grew up without fathers, so honestly, they don't understand the benefit of being with a woman outside of sex. They don't even understand how much less stress there is in having a girlfriend, especially if she lives with you. A lot of them would rather just aimlessly go out into the dating game and deal with the lowest common denominator of women.
They see men out here in the dating game having sex with women left and right, and they don't see the point in being with one woman sexually, when you can have multiple. However, this also stems from the low standards men have in the women that they date. Most of them don't require their women to know how to cook, clean, nurse, sew, massage, etc. Stuff that people used to consider basic back in the day.