A Bass guitar tends to be funky and more rythmical than the electric.
Electric Guitarists tend to be wilder, and generally better looking people (I play guitar and look like a monkey's uncle -.- but who cares).
Drummers tend to be the wildest and least seen!
Singers tend to be able to sing (most of the time) and are the best looking.
In order the groupie listing is as follows.
Singer/lead guitarist- Best groupies, first choice.
Drummer/rhythm guitarist- Good groupies, second choice.
Bass guitarist-Pick of the litter.