Soon after I first started I realised that married men tend to be easier in most respects, and ClaireJane is right. 40's and 50's are more reliable as regulars and appreciative. For a couple of years I avoided singles, especially the younger ones, but now it's about 60/40. There are downsides though, that it's as well to be aware of. I had a wife follow on one occasion who created a scene outside my home, and the same thing can happen on outcalls. You can also end up being used as a marriage guidance counsellor. I'm a good listener, but they do occasionally pour their heart out. Other than that, if you feel more comfortable with them, then why not.