Our 'therapist' (29M) asked if he could watch my girlfriend (26F) and I (26M) have sex.

Throwaway account.

My girlfriend and I have been together for six years. We don't really believe in marriage but our relationship is basically like a marriage.

For most of our relationship we've had a great sex life, but a little while ago we started to have some intimacy troubles, mostly related to self-confidence issues (mostly on my part). So we started seeing a couples/sex therapist, which has been helping. An important detail is that he's not a literal therapist-- like he's not licensed or anything. He's basically just a friend of a friend who's really good at helping people sort out communication issues and things like that. We meet with him for 45 minutes once a week, so functionally it's really just like going to therapy. I know this might seem weird but it's way, way more affordable than an actual therapist lol.

Recently he asked us if we would be open to him watching us have sex-- either in person or making a tape for him. He was very upfront that it wasn't related to the therapy, he just finds us both attractive and would be into watching us if we were okay with that. He could have couched it as part of the therapy process, but he was totally honest about where he was coming from, and I definitely respect that.

I feel a little torn, and I'm pretty sure my girlfriend does too. I find the idea kind of exciting-- and I know from past conversations that it's something my gf is open to/interested in. Like, in a vacuum, it's something that we could see ourselves doing. But it just feels so much more complicated since he's our therapist. He said that we could end our therapeutic relationship if that would make us more comfortable with the idea, but I'm hesitant to do that because I feel like we still have more to gain from it.

Do people think this is feasible, and if so, does anyone have advice for how to navigate it as best as possible?

tl;dr: Our therapist is interested in watching my girlfriend and I have sex (for strictly recreational reasons); we have some interest in the idea, but feel uncertain about complicating factors.