The PC -muscles (pubococcygeal muscles) are called your love muscles because they may influence your sex life in several ways. They are for instance responsible for the great feeling during orgasm, when they rhythmically contract, but they can also be the cause of pain during intercourse.

How can you find them?
Where are these love muscles located?
Why should guys exercise their love muscles?
Why should girls exercise their love muscles?
How to exercise your love muscles? (Kegel exercises)