One reason sexuality is so important when using Tantra as medicine has to do with our physical, mental, and emotional health.
Tibetan medicine, which uses Vajrayana (Tibetan) Tantric practices as healing methods, makes a direct connection between physical and mental well-being and a healthy sex life.
Unhealthy sexual attitudes, sexual abuse, and trauma can all be root causes of illness in the body and mind.
Lack of sexual vitality can be an indicator of disease.
Another reason sex is so important is that humans can not separate our sexuality from our basic humanity and be healthy.
Union of body, speech, and mind is fundamental to our mental, emotional and physical health and well-being according to Tibetan-based Tantra.