b.) Also refers to the male cock, whereas the cock being the stick that is placed between the lips; thus a lip-stick. Derived from the possible coating of the lips with sperm during oral sex as the male cock was brushed across the lips. This more than likely led to the development of the lip stick container; shaped much like the male cock, which the female brushes across her lips to apply it.
c.) Sexual slang for oral sex, as in “sticking”(the cock being used as the stick)fucking the lips; also know as “face fucking”, and “head banging”.
Just get on your knees baby and I will lipstick you with this hard cock.
Accidentally, I walked in on Sam and Sue and he was lipsticking her as hard as he could and she was begging for more.