I know two girls can hold hands but you have to be careful or youll get pregante

You rub butts together

The serious answer to this (or how two women have sex) is by whatever means they can figure out together. Anal sex, fellatio and mutual masturbation are common but not the only options. Frottage happens. You combine body parts and toys in creative ways until you figure out what works.

I wan say gex too >.<