Can you get pregnant if semen drips from your anus but you wipe it off immediately?

Yes, you can get pregnant, and all it takes is one determined little sperm to make it's way up your fallopian tubes.

Virgin girls have also gotten preggers when a boy jerked off into his own hand, wiped it off, then put his finger in her vagina. That one little sperm did the job.

There is also an interesting case where a girl put on her brother's pajama bottoms to answer the door and he had ejaculated into them earlier, and she got preggers. Well, that's their story, but I wonder about it. It could have happened that way I guess.