I've always found Texan accents really sexy, I had a lecturer at uni who had the sexiest accent I didn't learn anything in his lectures at all because I was too busy listening to the way he talked.
Also my best friend is from Scarborough and I love her accent. I think it's the exotic 'otherness' of an accent that makes it sexier.
My own accent is between Kiwi and Aussie (born in NZ, currently living in Queensland), nobody finds it attractive, my workmates reckon I buzz like a mosquito with my Kiwi vowels and can't understand me cause I speak twice as fast as any Queenslander. And my Kiwi friends all think I have an Aussie twang.