Vasodilation (big word) is also used to describe the effect of poppers.
There is a lot of medical terms to explain what they are doing but in a nut shell… sex for both partners is enhanced… euphoria is the official term used and it fits the bill. Poppers have been around for as long as I can remember… and while I do not use them with every sexual encounter I have… I do enjoy them occasionally.
A LOT of people here… who admit, or it seems… has never used them… but have very strong opinions about poppers and the people who use them.