During which phase does vasocongestion lead to erection in males, with the scrotal skin thickening and testes rising?

The excitement phase is characterized by the initial physiological and psychological changes that occur in response to sexual arousal. During this phase, vasocongestion—a process where blood vessels dilate and increase blood flow to specific areas—results in an erection in males. This is accompanied by the thickening of the scrotal skin and the rising of the testes, indicating heightened arousal and readiness for sexual activity. This phase sets the stage for further sexual response, making it distinct in the sequence of sexual arousal.

The following phases build on this initial response. The plateau phase involves increased intensity of arousal and heightened sexual tension, but significant physical changes leading to erection have already occurred in the earlier excitement phase. The orgasm phase is marked by the climax of sexual pleasure and not the process of achieving erection. Finally, the resolution phase is characterized by the return of the body to its resting state following orgasm and the cessation of sexual arousal. Therefore, the excitement phase is precisely when the physiological changes associated with arousal, such as erection and changes in the scrotum, take place.