Well I was actually referring to the strippers masturbating in some way shape or form as opposed to the guys but yes the guys usually do. All strip joints here have tissues available pretty much everywhere for that reason (especially in the peep shows and private rooms).
As for the strippers view on girls / couples well that depends on the club. Where I am we generally take a couple as 1 customer (1 guy = 1 girl = 1 couple ) price wise. As for how the stripper will treat you - depends on where you go and the girl you choose. As long as you and the wife don't start laughing or something you should be alright - it really depends on what type of experience you're looking for. Only time I really get upset is when I have a group of girls that just sit the entire time and giggle or a group of drunk guys who don't understand touching is a no no.
We've actually got a girl at work who when a couple comes in insists that the girl get up and strip with her, a bit of the whole "I'll show you mine when you show me yours" type attitude
Don't be nervous
strippers are just people. Go in there and talk to a few of them and then pick one you like.
Small tip for you - the girl you find the most physically attractive might not put on the best show. For example we do alot of private events (top less waitressing etc following by a strip / toy show ) Last one I went to there was 3 of us girls working there on the boat (fishing trip) Myself and Paris made alot more money then the 3rd girl working, Cleo, even though technically speaking Cleo is alot prettier simply because we got more tips and did more then take off our clothes and dance around a bit.
Take the girls aside (or atleast out of earshot of the counter) and ask about her extras. Make sure she does couples for example, don't do this near the counter because alot of these places techinically don't do those services. Where I work doesn't do more then 5ft away private shows for example.