I'd say to some people watching anime can screw up their perceptions of women. Anime girls are, in both terms of appearance and behaviour, perfect girlfriends for certain types of people (anime fans) and so of course real women fall short of these expectations. However, i think most anime fans are rational enough to recognise that there is a divide between fact and fiction, and that many anime girls are essentially wish-fulfilment characters with not base in reality.
Same goes for porn imo, since someone's brought it up. If a person's rational enough, they'll know that most women won't do the kind of things that pornstars do, and so should not set their expectations so high.
Also, on the subject of being single i'll share some thoughts:
If anyone is ever feeling down, depressed or insecure about being single, always remember that you have much more freedom than any individual whom is in a relationship. I was thinking to myself today what i would like to do after university. My ideas included, for instance, going somewhere like China to teach English, or working as a tour-guide in Europe, ideally in a German speaking territory so i can improve my German. Or, i could save up a load of money and go on a European road trip with a few friends in a mini-van and drive from youth hostel or youth hostel all across the continent. (Think perhaps like Scooby Doo, only less mysteries and more swearing, drinking, partying and hopefully sex)[footnote]Then again, it was pretty darn obvious that a lot of sex must have gone on in the scooby-gang off screen.[/footnote]
Then it occurred to me that i would be very difficult to do any of these things if i had a girlfriend. I couldn't turn round to her and say i'm off to the far corner of the world to teach English for six months, that would be unfair on her. If your a single adult, the only limit to your freedom is money, and that can be worked around by working. If you are an adult in a relationship, you've got your significant other to worry about.
I then happily thought to myself that i'm in win-lose-win-lose situation. If i actually do get into a relationship whilst at university (which is unlikely in my case) then i get all the psycho-social benefits that come from being in a relationship. If i don't get a girlfriend, hell i'm free to do anything i want.
So, to all the anxious single guys on the Escapist (yes there is a lot of you!) just remember that so long as you remain single, your only limitation is yourself. You are free, and your freedom only increases as you grow older and earn money, so long as you remain single at least.