Is the full ritual bath obligatory if the two circumcisions meet without penetration?

Question:
If a man’s penis meets a woman’s vagina without a barrier and without penetration, does that make the full ritual bath obligatory?

Answer:
Penetration is required when the two circumcisions meet, and the two circumcisions do not meet except through penetration: the man’s circumcision and the woman’s circumcision. If penetration occurs, the full ritual bath is obligatory, whether or not he ejaculates. As for mere touching without penetration, the full ritual bath is not obligatory unless semen is ejaculated; in that case, one must perform the full ritual bath because of the ejaculation of semen, not because of penetration. The full ritual bath is obligatory for one of two reasons: either the ejaculation of semen with pleasure, or a wet dream; or penetration.