A situational act generally described as sex. A sexual activity performed by two or more people. As events rise the definition of sex itself will differ, often unbalancing the mental, spiritual, and physical aspects of it.
Sex is usually used as a tool for fleshly gratification (the physical, to fuck), to feel wanted (the mental, to have sex), and love making (the spiritual, to make love). Sex also does not have to involve penetration, such as oral sex, yet it's common. The most common would be vaginal penetration or anal penetration of the penis.
She fucked me until I got sick of sex itself.