Guy fixing the sink: no
I guess the reason I said the guy should be boring outside of the bedroom is that if you want to only have casual sex with a woman without her wanting a more serious relationship-- I think you have to be missing something that would make her WANT a serious relationship with you. I had a few hot but no-strings things going on in my early 20's and they worked for me because they were great physically but I knew there was no future and so didn't get emotionally invested. I was happy with it just as it was, at least until I met someone that I could connect with on all levels. But each of those scenarious DID start out in kind of typical dating scenario, it certainly wasn't with the plumber who was fixing the toilet. Oh, but more than one of them were musicians that I met when I saw their bands play. Can you play an instrument or sing?
As far as how you know if they're good in bed...someone can be sexy and seductive which might make you think you could be in for a very good time. But if you're going to continue the casual relationship, knowing there is no future, you need to be getting SOMETHING out of it, hence the good in bed thing.