Oh hellll no I would never let a client use his own condoms for all of the reasons given already!
I've had a couple try but they never get very far...
Sometimes when I have my false nails on I let the client put the condom on himself. I am pretty shit at putting condoms on, I always feel like a fumbling teenager! However some of the ways they put them on and they're the ones with the penis I don't feel so stupid.
I hate it when they put it on the wrong way, then just flip it over! They always look so confused when I hand them another one.
Also, a lot of them question why I change the condom after oral, even though I always wear lipstick or lip balm, which obviously can weaken condoms.
It's unsettling that so many grown men have so little knowledge on how to use a condom...