misty0, you wrote:
"Girls go in a group with friends (and their old mums in some cases!) for a laugh."
Isn't it the case that most men go with a group of friends (or work colleagues) - maybe even with their old dads in some cases - and say they go for a laugh?
"Not working themselves and each other up into going off to masturbate in front of a naked 18 year old guy."
I don't think that's allowed in strip clubs.
"With a bit more chucked in for a bit of cash."
I don't think soliciting is allowed either. I understand that the clubs and dancers make a great deal of money doing what they do and would lose their license and therefore their business if they allowed soliciting. I don't think the dancers are prostitutes - it's okay to disapprove, but saying they also have sex with clients is not right if it's not the case.
"I can be fairly insecure sometimes, given to feeling not attractive enough for my OH (hes never done anything to make me feel this - its just me)"
You should take this seriously and do something about it for both your sakes. You must feel dreadful and he must feel the same because if he really fancies you but you don't believe him, no matter how understanding he tries to be, it's very invalidating and is going to hurt.
chandellina is absolutely right that requiring women execs to 'entertain' clients in lap dancing clubs is outrageous. The same applies to male execs because some men do strongly disapprove as a perfectly legitimate matter principle.