PURITYYY

yaoi with less sex ?Shounen ai ? xD hmm, maybe :

Usotsuki wa koi wo suru
Little Butterfly
Mankai Darling

http://www.mangago.me/r/l_search/?name=yamamoto%20kotetsuko < less sex. haha

yaoi with less sex haha that sounds kinda funny but I recommend seven days
http://www.mangago.me/read-manga/seven_days/
and the works by the author of seven days.
for yaoi with less smex, go to the shounen-ai portion.
hope this helps

Shonen ai : Sayonara, Heron