I'm pretty sure that you mean erection, and an erection is when the male penis, during arousal, fills with blood and becomes hard and upright.
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it is used for ur computer address also known as a boner. an irrection
it can depend. if your talking about the penis, a teenage boy might get it because it's natural, but sometimes he may get horny.
For a woman size does not matter...... what does matter is the irrection and timing of sex and women love those men whe can generate great sex before intercourse.
To get a guy to be fully erect just try flirting with him. If your really that desperate then jsut push him onto the bed/grass and sit on his waist with your legs on either side of his body and flirt with him that way. He'll get the picture.