when a male inserts his penis into the female's vagina usually the penis is pulled back and pushed in to create stimulation for both people (this could be done by the movement of the male, female or both) can be done from many different positions The female should be turned-on so that her vagina is naturally lubricated ('wet'). You can also use lube like KY Jelly or Astroglide to help with any dryness. The male cannot penetrate the vagina unless his penis is completely erect. If the male is nervous, he may have trouble getting an erection. If the female is not relaxed, her muscles may be tight and it may be uncomfortable for her. If a female has never had sex, the penis may need to break through her hymen. This may be uncomfortable, and may cause a small amount of bleeding. If you have a physical disability or an injury, experiment to find the positions that are most comfortable, for example, positions which will put the least pressure on sensitive joints, and cause least fatigue. Wait until both people are ready, aroused, and interested. It may not be for you. People have sex acts they like and those they don't. Sometimes your preferences will change over time. For more info, go to Losing Virginity