In Jain Dharma, sex before marriage is generally not allowed because it is seen as part of brahmacharya — self-restraint and purity of conduct.

Main reasons:

1. Control of desires

Jainism teaches that uncontrolled sensual desire increases attachment and bondage of karma.

1. Protection of brahmacharya

Brahmacharya is an important vow in Jain life. It helps reduce passions like lust, which disturb the soul’s peace.

1. Faithfulness and responsibility

Marriage is considered the proper and responsible place for family life, discipline, and mutual commitment.

1. Non-violence and purity

Jain ethics aim at minimizing harm to self and others. Strong passions can lead to emotional harm, imbalance, and karmic bondage.

1. Progress on the spiritual path

The goal in Jainism is liberation of the soul. Sense indulgence, when uncontrolled, pulls the soul away from spiritual progress.

In short, Jainism emphasizes self-control, purity, and reducing attachment. That is why sex is reserved for marriage in the गृहस्थ life, and even there it should be governed by restraint and responsibility.