Well there is an unfortunate skew in society's perception of women who haven't settled down long term by the end of their twenties. Guys seem to get away with it, but women get put under a lot of pressure to not be single in their 30s, ala Bridget Jones n whatnot.
I've never understood this - despite it being nice to be in a relationship, if it came to it I'd see no problem with spending the rest of my life on my own.
There's an upside to being on your todd - porn and pizza night is every night! (not that I am, so I have to wait until she's away for the evening... )