some of you guys should at least try to get out on a date first prior to commenting on dating life.
There are a lot of single moms and dads now a days (I am not one). People have sex and a lot of it (except here it seems as any topic about it you have 90% thinking it's shens).
Most modern girls aren't looking for a b/f yet alone a dad for their baby. Most of the single mothers I have dated, have the father's in touch and covering the expenses they should...there are always psychos though...
The biggest problem you'll have with single parents is free-time. There is a lot of running home to pick up the kid, figuring out who will watch the kid (mom, dad, grandma, a sitter, etc), then times when things are planned but the person supposed to babysit is a no show.
Other than that, there is no difference in dating them. From my talks it's actually more guys that try to get serious with the chick thinking they can guilt them into a commitment because children need 'fathers'.