Petroleum and oil-based lube
Petroleum and oil wear down latex and cause breakage. If you're using a latex condom, you should avoid oil-based lube --
period.
This includes petroleum jellies (such as Vaseline), massage oils, hand
and body lotions, shea butter and Crisco! (Anal walls weren't made for
baking). Oil-based lubes can be used with polyurethane condoms;
however, the oil can leave a coating on the anal or vaginal walls and
can cause bacterial infection.
This doesn't mean that sex has to be completely fat-free.
Massage oils and lotions are superb for massages, muscle-flexing and
posing, oil wrestling and all sorts of sexual fun, including
masturbation.
Guys who have tightly stretched skin when erect often
prefer to use lube for masturbation to help prevent chafing of the
skin. A popular lube for solo action is Stroke 29 Rocket Fuel, which is
known for its high viscosity, and it heats up with friction.
A final word of warning about oil-based lubes: They stain. (Laundry time!)
Water-based lube
Water-based lube -- the most common type of lube -- is
latex-condom-friendly, so it's safe to use with your Trojan or Durex
brands. The main ingredients are water and glycerin, so cleanup is
easier, and it won't ruin your sheets.
Saliva is water-based but dries
quickly, so it's not recommended as a primary lubricant. However, spit
can be used to refresh a lube that starts to lose its glide, which
water-based lubes tend to do. A couple of recommended H2O lubes are
Astroglide Personal Lubricant, which is very slick and long lasting,
and Liquid Silk, which looks and feels like semen.
Silicone-based lube
The newer and more versatile lubes are silicone-based, and can be used
with either latex or polyurethane condoms. Silicone is waterproof, so
it's great for underwater sports of all kinds. It lasts longer than
water-based lube, and you don't need to use that much.
Wet Platinum is
a popular, long-lasting and very slick lube. Try Gun Oil for
masturbation. The thing to keep in mind with silicone is that it
cannot be used with silicone sex toys because it will destroy the toy -- kind of like rubbing two panes of glass together.