Ginyuu Mokushiroku Meine Liebe, Gakuen Heaven Recommendations
Both center around boys-only schools with students of exceptional skill, although Gakuen Heaven is more light-hearted and BL while Meine Liebe is more dramatic and immersed in European history.
In both animes practically all characters are male - very handsome and beautifully drawn, a feast for eyes. Both animes are set in boarding schools but the period in Gakuen Heaven is modern and in Meine Liebe it has a historical atmosphere. Not much plot, too, but it is unnecessary anyway, the main enjoyment is in looking at the handsome guys :)