I'm sure in many cases it is all about the sex, but I've found that "household" RP can be very rewarding but requires just as much maintenance/care as a good motley/coterie/ect.
I have been lucky in that even though for the most part while playing a ghoul I have had slutty domitors (whether or not this was known to me ICly or OOCly has been highly variable) for whatever reason I have almost always gotten on very well with the other thralls/ghouls. To the point one time where I think we pissed off the regnant because he kind of became secondary. (But I'm not sure what he expected not spending much time developing further RP ties/relationship while chasing more tail, while we were waiting around so decided to...you know...actually RP with each other, run things for each other, have fun in nonsexytimes ways which can be more bonding as a group really. I think it took us a couple of weeks to notice that he'd not logged in for awhile.)
However, I have seen some really craptastic drama go down in other groups. Especially if the "leader" doesn't bother to outline expectations/realities very clearly, or they do things against the way they said they would. (For example, if it was agreed at the outset that all members of the "household" get a say in adding someone new to the stable, and she or he decides just this one time to admit this other person who's very nice to them but is a real asshole drama queen/king to everyone else behind the leader's back, ect.)
So if someone did not want to share in a pick-up/strangers situation, I can understand that. I have seen non sexual groups totally destroyed by the admittance of one drama hound.
I actually with the right people prefer a household/stable, to be honest. I don't have a huge amount of time and my timezone seems off kilter with the east-coast centric playbase at a lot of places. I do not like hoverers or hovering. If I get along with someone well enough to consider playing a ghoul with them, then chances are I will like other people that they enjoy the RP styles of, so if they can loop in more people for me to play with (or vice versa!) that I already know are compatible with someone else I enjoy, then why not?
It only becomes a problem of time (if someone has very little time, divvying it up with folks who don't share well with others would not be my first choice) or personality (sadly, there are a minority of people who really are nasty to people who they perceive as OOC competition, no matter how untrue that is).