From a Jain perspective, sex is a matter of kama (sensual desire) and is governed by vows, virtue, and the aim of spiritual progress.

• For monks and nuns (renunciants): all sexual activity is strictly forbidden. It is considered a serious violation that creates negative karma and obstructs liberation.
• For lay followers (householders): sexual conduct is allowed within the frame of marriage and with mutual consent, non-violence, and fidelity. Excessive indulgence, exploitation, harm to others, or actions driven by uncontrolled passion generate negative karma and hinder spiritual progress.

There is no Jain teaching that "sex with the soul" is an allowed or meaningful act. In Jain philosophy, the soul (atma) is the pure, eternal principle; sexual activity involves the body and the mind, and its karmic consequences arise from attachment, intention, and the impact on others, not from any interaction with the soul itself.

If you meant a specific scenario (for example, sexual behavior outside marriage, or masturbation, or a question about the Digambar/Shvetambar nuances), I can explain that more precisely in light of Jain texts.