Are there any explicit yaoi out there.
Pure sex; one that pretty much amounts to hentai.

You can try works from Mizukami Shin and Sadahiro Mika since their titles can be tastefully porntastic.
There's also Chitose Piyoko and Minami Haruka. I think HIGASHINO You's works can get pretty smutty too.

You can try...
Under grand Hotel - Porn with plot. :3
Nipple Boy Fragments (shota)
Moho Love (shota)
Baby Bitch! - i think.

Here are some super-awesome threads!
If you just want some hardcore titles
If you don't mind BDSM
Same as above