However, for people of some religions, taking a sex act like fellatio to completion is considered a sin. For example, people of the Catholic faith believe that spilling semen outside the womb is immoral because it diminishes the reproductive purpose of sexual interactions.
The phrase to completion can apply to sex acts enjoyed between couples and solo exploration. Masturbating to completion involves sexual stimulation, typically with the hands or a sex toy, to the point of orgasm.
Many people consider having penetrative sex to completion as having sex until a male ejaculates. However, others believe that sex to completion should involve the orgasm of both partners. This definition also does not consider what to completion might mean to couples that are not straight, such as a lesbian couple.