Your skin starts to flush, your muscles get tense, your heartbeat gets faster, blood starts to flow quickly down to your penis or clitoris and vagina. The vagina gets wet and the scrotum withdraws. Everything that happened in stage 1 gets even more intense.
You feel yourself drawing closer and closer to orgasm. This is the stage where you should get ready to stop or slow down stimulation.
A series of nerve and muscle responses occur, resulting in a feeling of ecstasy, increased lubrication in the vagina, and ejaculation of semen from the penis.