Lube! Lube! Lube!
I am a bit of a preacher when it comes to the joys and benefits of lube, even for solo masturbation. So many people overlook the need for lube, totally forget in the heat of the moment, or go with the Jenna Jameson method of using spit. The spit method really gets to me because not only it is entirely not sexy to hear someone hocking a loogie, but I certainly don’t want random crap from the bottom of your lungs on me and it isn’t very effective lube anyway.
Last year I advocated for lube as a gift. I myself am madly in love with Yoni Butter because it feels good, tastes good, is all natural, is very moisturizing and absorbs nicely.
Lanius of Cast Upon the Thorns, has come up with a really useful guide to selecting the best type of lube for the activity that you’re planning.
Babeland also has a helpful guide to choosing a lube.
I’d like to add that you should seriously consider only using glycerine-free lube, because many people, myself included, are sensitive to it. Nothing ruins the moment like, “Ouch! That burns.” Also avoid cheap novelty-type flavored lubes because they will often contain some type of sugar. Nothing will give you or your lady a yeast infection quite like putting sugar up her cunt!