1.When two people are making out (gays and lesbos included) and they're kissing each other everywhere both people are usually very horny. Both people are breathing heavily they both or one of them tend to have their shirt of and are on top of each other. In between 2nd and 3rd base on the sexual scale.
2.When two hardcore people are making out or kissing
1.My boyfriend was kissing my boobs and we were both breathing heavily. GOD, it was SEXY!