I don’t have a threshold yet, but I have IH unscented 4x and have used 3 or 4 sprays. (Equivalent to 12 or 16 regular for you math neanderthals) However, I would do it under clothing or use it to defuse the intensity of sexual mixes. What if you used Come Talk To Me Mix 2 with IH?
I’ve worn it in the car for hours and people BOND. I mean they take turns spilling their own dirty laundry - for hours - like you wouldn’t believe. Myself, I keep my lips zipped, which they appreciate because it gives them more time to spill their guts. 
Cheers,
Quicksilver
P.S. that last paragraph sounds like a testimonial, don’t it?