Loc: CA - Los Angeles Area
Ok! Just to let you know that I have not done it myself; usually someone else has (but with a condom) .... I do not remember which web site, but you could google it.... there is a plastic syringe type device that you could use... just masturbate into a small pill cup and then suck up the sperm into the syringe and stick it up your butt and push the plunger... done deal!
The syringe has a needle like plastic cap, along with the base and a plunger type handle... because it does give directions on how to put lube up your butt for better comfort.
Just look for any male anal sex type lubrication and I am sure something will show up.