The angle of erection varies from man to man but in general the younger a man is, the more his erections point up. As a man gets older he takes longer to reach a full erection and he may need direct stimulation of his penis.

During sex a man's testicles also increase in size and in most men at a certain point they elevate, pressing up against the pelvis. This elevation means ejaculation is near.
Ejaculation happens in two stages. Semen is formed during the first stage, when rhythmic contractions propel sperm from the testicles into the urethra to mix with seminal fluid from the seminal vesicles and the prostate. A man who experiences these contractions may say, "I'm coming"; he feels he's on the verge of orgasm, and at the point of no return.

During the second stage of ejaculation, contractions of the urethra, the prostate and the pelvic muscles propel the semen out the opening of the urethra. About a tea-spoonful, containing 100 to 600 million sperm, is ejaculated at one time.

Here in the West we assume that orgasm, the intensely pleasurable feeling that accompanies ejaculation, can only occur during ejaculation this is not the case. Ejaculation is possible without orgasm (boys do it when they have wet dreams), and orgasm is possible without ejaculation. According to Chinese and Indian philosophies, orgasm without ejaculation is the path to ecstasy and superior health.

Orgasm can feel localized in the penis and testicles, or it can be more of a whole body experience. In the Hite Report on Male Sexuality one man says the sensation travels "down the back of my legs to the knees, upwards”.