 Moreover, one or more parties to the act might experience pleasure-as-sensation, yet not enjoy the activity itself. One can experience the pleasurable sensations of sex and enjoy the act, yet feel repulsion later. We can thus see how each pleasure has its opposite: one can feel painful sensations during a sexual act (e.g., at being anally penetrated), one can endure a sexual act (not enjoy it), and one can feel nausea at what one has done sexually.