Sexy is a tag used for artworks that are sexually stimulating, but usually in a minor level compared to other expressions in this site.
Also, according to www.dictionary.com :
*****— adj , sexier , sexiest
1. provoking or intended to provoke sexual interest: a sexy dress ; a sexy book
2. feeling sexual interest; aroused
3. interesting, exciting, or trendy: a sexy project ; a sexy new car