‘Kiss Scene rough sketches – Drawing for Boys Love (Yaoi)‘ A 103 page book/CD rom with male/male kissing scenes, from many different angles, for artist drawing references.
Other art references like this can be found here:
A fabulous fuck-ton of male/male love references (per request).
And I’m gonna add the following:
DO NOT JUDGE THE IMAGES BY THE PIXELATED THUMBNAILS. These are very good/accurate poses once you enlarge ‘em (I wouldn’t be sharin’ ‘em if they weren’t).
Spectacular references for kissing and perspective.