It’s a guy who I’ve seen before who’s just asked if he can use them.
He says that using poppers at the same time as receiving a prostate massage gives him the ultimate orgasm. Apparently.
Not seen them in years and just wondered what others thought.
You need to decide your own policy, for me I want to know if they are experienced, will they use them in a responsible way which does not involve open bottles that could spill, expose me to the fumes or damage my belongings. Some people are sloppy users, or just aren't aware of the damage they can cause give it zero thought.
If it's one client, who you have only seen once or twice, and you aren't involved in BDSM (and even then there are many who won't allow this), then do not be afraid to just say no.