For a Jain śrāvaka (lay follower), intimacy is governed mainly by the Brahmacharya Anuvrat (limited vow of chastity).

In very simple words:

1. Only with one’s own spouse (svadharma‑patnī / patī)

- Physical intimacy is allowed only with your own lawful spouse. - Any relation outside marriage (affair, prostitution, online sexual involvement, etc.) is adultery and a grave sin in Jain dharma.

1. No violence, force or cheating in sex

- Forcing the spouse, blackmail, or emotional pressure is against Jain conduct. - Cheating on spouse, even mentally planning or enjoying such thoughts, is counted under abrahmacharya (break of chastity).

1. Control, not indulgence

- Even with spouse, sex should be limited and with self‑control, not constant indulgence. - Sex only for enjoyment, with strong passion, dirty imagination, etc., increases kām (lust) and bad karmas.

1. No self‑abuse / perverted acts

- Masturbation, pornography, and other perverted or unnatural acts are also abrahmacharya‑bhanga (break of celibacy) for a śrāvaka. - Jain dharma teaches to protect the mind from sensual excitement.

1. Guarding the senses

A śrāvaka should avoid things that excite sensuality, like: - Looking at others with lustful eyes - Consuming vulgar content (videos, chats, images, literature) - Talking, joking or flirting in a sexual way with others

1. Higher level: complete brahmacharya

- Some śrāvaks/śrāvikās at higher spiritual stages (pratimās) take the vow of total celibacy, even within marriage. - Monks and nuns follow absolute brahmacharya (no touch, no sensuality at any level).

1. Digambar–Śvetāmbara view

- Both traditions agree on the basics: - Śrāvaka must avoid adultery and any form of sexual misconduct. - As one progresses spiritually, the ideal is complete renunciation of sex. - Details may differ in specific rules, but the core principle of strong restraint over sexual passions is the same.

If you want to read a Jain‑Dharma–based explanation (in very simple language) about sex and brahmacharya for laypeople, you can see this answer on JainKnowledge