Use during sex with my GF

So I really enjoy using my aneros helix during sex with my gf…I have never used it solo…but really enjoy getting oral while inserted. I would like to incorporate it more during sex…but I can’t stay erect while using it during sex…does anyone else have this issue or any advice.

Using Aneros Helix

I M48 use this with my GF61 I don’t use it for king periods…sometimes while I’m getting oral from her…but I do have difficulty staying hard with this inside me…anybody else experience this? I would love to use this during penetration…any other tips?