Women have a clitoris above the vagina and women can have female ejaculation through the vagina. Only a trans woman would have an actual penis. Is that what you are talking about?
Uh, huh? Women don't have semen. Men do. Women do ejaculate, but not a whole lot, though some do more than others. I think you might be confusing orgasm with ejaculation. Men ejaculate because sperm needs a strong push to survive the trip to get to a woman's ovary and fertilize and egg so the human species reproduces. The stronger the ejaculation, the more potential of success here, as success us actually quite rare. Orgasm is a different story. Because women don't produce sperm the biological purpose of their orgasm is different than that of men. While men orgasm to spurt out a substance, women reach orgasm so they will want to have sex and go through the very painful and, for most of history, quite lethal process of pregnancy. Takes a lot of motivation to go through that ordeal. It also helps make their bodies more receptive to receiving sperm. Sex is pretty fascinating, and learning about it helps make it more pleasurable, so you might consider reading up on the process. It's truly amazing anyone ever successfully conceives. Peace.