It would be nice to have a family because well.... friends and family members show how it is not to come home to an empty house. Then again, I also have some friends who are leading this kind of double life, and I can see it can be very stressful. I also don't know if it would be fair on my hypothetical human significant other to always be no. 2 after the mare, not to mention the sexual aspect: would my difficulty getting aroused by people be too much of a giveaway?
If you opt for fostering (as a single parent), then it might be they will not accept you because of a lack of a social circle, or perhaps because you're working fulltime.