Diego,

I have had a tantric teacher, and we never had sex… and it certainly had nothing to do with polyamory.

Consider joining her, like taking the class together. The best way to approach fear is head on, in my opinion, and right now, perhaps you’re jumping to conclusions without any information. At worst, you’ll find out you’re not interested and move on, and at best, you could find your love life a lot more sparkly, with a partner that is enthusiastic about it.

Any reasons you don’t want to take the classes with her, whatever she’s aiming at? If she’s interested, why aren’t you?

With warmth,
Matt