I think it depends on the level of crush we're talking. Not sure a full on 'touch of the shys' when you're near them type of thing would benefit a relationship but an open school girl crush on someone (say a celeb) who is totally unavailable might be OK.
The dressing up as Jonny Depp sounds just plain off putting to me. The thought of DH dressing up to fulfil my fantasy doesn't do it [shudder]
I think it depends if it remains a crush or becomes more of an obsession though and who it's with. How much time thinking about the other person are you talking about? if it's just a sexual thing then I'd say fair enough but if you're thinking about the other person at other times I'd say it was more than a crush. Out of interest, what would you think if you found out your DH had a secret crush? I guess that's how I'd measure it's impact on your relationship
I new the moral bit would come into it. The thing is, you can't help fancying people. I think it's quite natural for your partner to fancy someone else sometimes - whether they admiot it or not. How could they not? It isn';t immoral to fancy someone, just to betray someone. It might be immoral to tell your partner that you really fancied soemone else too. And I'm just talking crush, a passing crush, not obsession. If you're obsessed with someone else you are probably going to be making your other half demented.
Oh no story. I have had the odd crush over the years and it has helped sometimes in the feeling more frisky department is all. I;ve never imagined being with someone, actually having sex with someone else when with DP - or exDP now (we split for other reasons not this).
I found I only had such crushes when me and DP were in pretty miserable periods though. I defo saw people I found attractive all the time but only ever fancied them if DP was being a twat really. And they were always unatainable - I am wired for monogamy.
Well you asked if it was good for a relationship. I don't think I was taking a moral high ground I didn't say no you shouldn't think about other people under any circumstance did I? Surely a balance of replies are what you want when you ask a question or you may as well not bother Of course it's natural for us to find more than one person attractive but I do think it can impact on a relationship when you start adding a third person into the emotional mix which I think a crush does. For you it was an emotional response to unhappy circumstances which presumably helped you regain your relationship. I don't think those are the same circumstances as the ones suggested in your OP though which is where I was coming from.