lubrication

a substance that allows easy access into a woman

Substance that makes it easier to slide an object into a mans asshole.

n., alcohol, tonsil paint

Lubricant can be used to avoid breaking a condom during vaginal or anal sex. To be compatible with condoms, it should be mentioned on the lubricant, usually water based or silicone based. It may be better than saliva but has to be renewed also. However if you are only looking for casual hookups, it is better that a woman chooses a lubricant that she tried alone first, since some people have allergic reactions (even with organic lubricant) and guys could lose the opportunity to get laid if it happens!

to make easier to use or slipperier;)

To make something slippery. A more erotic explanation would be to make the penis or vagina more slippery and hence achieve a better rubbing feeling when the sex organs are rubbing against each other. Men produce a lubricant called precum while women secrete vaginal fluid that makes the vagina walls wet.

A really glossy slick gel, sometimes found in flavors which you put on a males penis to make it easier, faster and harder while having regular, oral or butt sex.