Snowballing is a sexual practice where, as part of a sexual act, one person takes the other person's semen into their mouth, and they then exchange the ejaculate between them by kissing.

Snowballing is commonly seen in pornography. Because it involves exchange of bodily fluids without any barrier, it is not generally regarded as a form of safer sex. Risks are presumably similar to those of fellatio.

Snowballing is mentioned in Clerks, a movie by Kevin Smith.