I've paid for one.. taken the girl to the clinic, etc. Oddly enough it turned out it wasn't mine, but still, interesting experience!
How did you find out?
A very close female friend of mine, who was also a friend of the girl in question, notified me a few weeks later that 'at first she thought it was yours but when the doctor told her how long she had been pregnant she realized it was the ex-boyfriend!'.
Seems she thought it would be better not to mention that - though in truth I wouldn't have minded paying for it regardless (it was only about $400). Interestingly, it was
very hot having sex with a pregnant girl - it never really 'showed', but her boobs got huge and she was hornier than usual.