Don't smoke but with a 5mg hybrid edible I can have multiple orgasms and not ejaculate. Then when I do it is so intense I nearly pass out. Love having sex when I'm high.
I suggest a hybrid Δ9 capsule or mint that is equal parts CBD to THC. Either that or a few drops of a THCo alt cannabinoid tincture followed with the same CBD level.
I use a 25mg delta-8 edible and take it in two halves an hour or so apart. It takes an hour or so to kick in, but then it's a nice warm comfortable horny buzz.
Quite often if our threesome partner was nervous we would have weed or drinks before, sometimes after the first round while getting ready to go again. Also a hot tub works wonders