I generally prefer fewer closer relationships than many less involved ones. I enjoy getting to know people really really well and then spending lots and lots of time with them. This extends beyond romantic relationships, for example I have only three close real life friends. Also I have a strong desire to have lots of children.

There are also non-trivial opportunity costs in terms of my relationships with others for going for a non-standard option. I'm already having difficulty getting my immediate family to recognize and respect both of my current relationships. I'm having even greater problems with their families.

This is the reason that on the scale of many or few partners, I lean strongly towards few, and I generally tend towards a partner count of one or monogamy. Since I'm in a relationship with two women, both of the relationships are otherwise exclusive, I don't think I deviate that much from my stated preferences.