In Jain dharma, whether sex is “wrong” depends on who you are and how it is done.

1. For monks and nuns (sadhus, sadhvīs)

• Any sex is absolutely wrong.
• They take the Mahāvrata of Brahmacharya – complete celibacy in body, speech and mind.
• Even sexual thoughts and deliberate arousal are faults.

2. For lay people (householders – śrāvaks/śrāvikās)

Sex is not totally banned, but it is strictly controlled:

• Allowed

- Only with your lawful spouse (swadara‑santosh). - With mutual consent, care, and non‑violence. - With moderation, not as constant indulgence.

• Wrong / Paap in Jain view when it involves:

- Before marriage or outside marriage (premarital or extramarital). - Cheating, force, manipulation, or any kind of himsā (violence/exploitation). - Excessive lust, addiction to sex, pornography, or pleasure-seeking that pulls you away from dharma. - Sexual acts during periods when you have taken special vows of tapasya, Paryushan, Paushadh, etc., where celibacy is expected.

Both Digambar and Shvetambar agree on the main points:

• Ascetics: complete celibacy.
• Householders: limited sex within marriage, with strong self‑restraint, moving gradually toward more brahmacharya.

3. Spiritual view in simple words

• Sex is powerful; it easily creates attachment, jealousy, anger, deceit.
• These passions cause karmic bondage, so Jain dharma teaches:

- Start from discipline and faithfulness, - Then gradually move toward more purity and celibacy as you progress spiritually.

You can read more detailed Jain answers on this topic here: “Doing sex is permitted?” “Why sex is sin? If not hurting anyone”