Fett you make me lol.
I would have thought it a bit odd to ask that kind of question on this forum- I mean, if the attraction is muscular women then I'm sure most guys here would be more like fascinated/interested than intimidated.
My biceps are about the same size as those of my fiancé (they haven't really gotten smaller since I stopped lifting) and he's 6'3'' 290lbs of muscle and fat (he also used to lift ysee- I know he's not thin but it's just a point). But then he's still stronger than me- being 11 inches taller than me and the male thing probably has something to do with it. I couldn't win him in an arm wrestle- but I could crush him with my thighs, they're like stupidly strong for someone that doesn't lift anymore. And seeing as my center of gravity is generally lower, I could floor him pretty easy (his skinny friend in Judo can just on that principle).
ANYWAY, my point. He's not intimidated by me being a strong woman- lol but maybe his sister he is... she's scary

But then he doesn't exactly like the idea of me lifting again, though that's an attraction thing, apparently.
However my friend James, who'se about 6' and is one of the skinniest things alive (I wonder how he's still alive sometimes) is TERRIFIED of a woman that's even toned.