generally I don't find them as funny, but this isn't bad.
most men in lonely hearts ads post having a good sense of humour as being one of their strengths and most women in lonely hearts ads post that they are looking for somebody with a good sense of humour. it's just how we're made. in fact the action of laughing, with the head thrown back and pants of air, is likened very much to an orgasm and is obviously key when we look for a potential mate.
I'd recommend reading Jimmy Carr's book "The Naked Jape" (a funny title, especially when urban dictionary says a jape is a wank with an old sock), provides all sorts of insight on the science and history of humour. also there's a joke on every page (literally).