Astrology is a possible topic.  The Sun has an effect on our life, in the same way, the distant Nine planet also has an effect on our life.

In a spiritual or philosophical sense, Tantra is a set of ancient traditions that originated in India. It's about seeing the divine in everything, breaking conventional boundaries, and often using rituals, breathwork, meditation, and sometimes sexuality as ways to experience deeper reality. It's not just about sex (even though that's what many people in the West associate it with) — it's a whole spiritual science aimed at liberation.