When it gets dried out, it is sticky and not really a fun time.....precum works much better as does a good lube.

Precum its the best hahaha i like massaging my head w my precum its awasome

Precum, is a great lubricant. What biology designed it for. Cum, on the other hand (no pun intended), gets sticky after a short period of time. There is, however, no reason not to use sperm for what ever you want. Cum is highly erotic. It's color, texture and taste, not to mention source. Have fun, I'm going to...D.