Pieles are easy-going girls who can be found in "antros" (dancing clubs), "perreos" (reggaetton dancing parties), etc. Girls which one can take away easily and have fun.
"Piel", in singular, is a girlfriend, too.
Come home with some "pieles"!
I love my "piel".
1 a : to cause to turn aside or away from what is good or true or morally right or what is generally done or accepted b : one given to some form of sexual perversion c : an aberrant sexual practice especially when habitual and preferred to normal coitus d : someone which has these characteristics and can act upon: bastardize, bestialize, brutalize, corrupt, debauch, demoralize, deprave, warp