Answer

In Jain Dharma, an incest sexual fantasy would be viewed as an impure and harmful form of sexual attachment, because it strengthens rāga — craving, attachment, and passion.

Jainism does not only look at outward actions; it also gives great importance to inner thoughts, intentions, and fantasies. A fantasy that increases lust, objectifies others, or disturbs purity of mind is considered spiritually harmful.

Explanation

Jain ethics emphasize:

• Brahmacharya — control over sensual and sexual passions
• Samyama — self-restraint
• Ahimsa — non-violence in thought, speech, and action
• Aparigraha — reducing possessiveness and attachment

Incest-related sexual imagination would be seen as especially problematic because it involves inappropriate desire toward family relations, where Jain values expect respect, purity, restraint, and non-possessiveness.

For householders, Jainism accepts lawful married life with restraint, but encourages avoiding uncontrolled sensual indulgence. For monks and nuns, complete celibacy in thought, word, and body is required.

Spiritual Understanding

From a Jain perspective, repeated sexual fantasy binds karma because it feeds passions such as:

• Attachment
• Delusion
• Lust
• Mental agitation

The goal is not to hate oneself for having thoughts, but to become aware of them and gently reduce them through right understanding, restraint, prayer, meditation, and wholesome conduct.

Takeaway

Jain Dharma would not encourage incest sexual fantasy. It would guide a person to purify the mind, reduce lustful imagination, maintain respectful family boundaries, and cultivate inner restraint with compassion toward oneself.