Mates usually. I avoid all durex brands. I don't like the lubricant, and I use lube anyway. Gel not the liquid. I have a glass reusable syringe which can be put in boiling water to clean it. I load that before the client arrives, then it just takes a couple of seconds to put it in. I think also loose fitting condoms are a problem, worse than being tight. The important thing is to make sure he is fully retracted and then put it on so that it fits snugly over the head, not forgetting to squeeze the air out, and don't let the client touch it either. If it's a good fit it will be sensitive with some lube and shorten the time it takes the client to cum.