Can a woman become pregnant even if she doesn't have sexual intercourse?

Yes. Pre-ejaculate (pre-come), the lubricating fluid that leaks out of a man's penis when he's sexually excited, can sometimes contain sperm. If pre-come or semen (come) get inside or around the entrance to the vagina, this can lead to pregnancy. They can also pass on a sexually transmitted infection.

Semen and pre-come can be transferred to the vagina on fingers or sex toys, so it's important to make sure they're clean and washed before they go anyway near a woman's vagina.