Q. I am 16 and just entered college. I know pretty much nothing about sex etc. How can one know that one has reached orgasm?
A. Orgasm is like a sneeze—it is difficult to describe but once you have had one, you know what it feels like. Usually, one experiences a heightened sexual ecstasy accompanied by rhythmic vaginal contractions (sometimes) in females and ejaculation in males, followed by a feeling of relaxation.

When one reaches orgasm, one usually has gasping uncontrolled movements, or a sense of suspension, which is non-verbal, signs expressing that one has had an orgasm. Later, after completion of the sex act, one appears calm and satisfied. The signs of having had an orgasm are quite fleeting. The best way is to ask the partner.