I feel as if I keep repeating myself
, but I recommend pretty much anything by CLAMP! Card Captor Sakura does have magical elements and cards in it, but is really pretty innocent. There are some implied feelings between male characters and between female characters as well, but I did not find them offensive or blatant nor did they detract from the overall manga (and yaoi and yuri are two of the very, very few things that offend me in manga and anime). CCS is a wonderful manga and certainly worth a try. A CLAMP title with basically no offensive elements whatsoever, yet still with excellent art, is Angelic Layer. Clover is good too, and so is Magic Knight Rayearth (if you don't mind magical elements).
Happy reading!
Spiritsword