In Jainism, sexual conduct is governed by chastity and harm-free behavior.

• For monks and nuns: Brahmacharya (celibacy) is strictly required; sexual activity is not allowed.
• For householders (married or with family): Sexual relations are allowed only within marriage and should be practiced with mutual consent, fidelity, and self-control. It should not involve harm, exploitation, or excess.

The specific act you mentioned is a sexual act. Jain ethics emphasizes restraint and non-violence, so such acts should be considered only within the context of a lawful, mutual, and respectful marriage, and always with age-appropriate and informed consent. If the person is underage, any sexual activity is inappropriate and not permitted.

If you’d like, I can share a concise Jain teaching on brahmacharya and right conduct from authentic Jain sources.