Some accents are definitely sexier than others...Czech, Russian, Polish, Latvian, Lithuanian, French, West Coast Irish, Canadian and public schoolgirl English have been among my faves...but it mostly depends on the girl it's coming out of...some just ooze sexiness and seduction.
Brummie sounds really deflated...Essex, Notts & Lancs sound really chavvy, but those girls have been very earthy and up for it.