An orgasm is a response to sexual arousal. When you get turned on, your pelvic area, including your pelvis, vulva, and clitoris, begins to swell with blood. “This can involve any part of the pelvis, or just one specific part, including your vagina, G-spot, clitoris, or rectum. It's all connected,” explains Rabin. The increased blood circulating in your vagina is what gives you that warm.