I am a 19 year old boy. I am attracted to our house maid who is 10 years elder to me. During an excitement, I get strong erection and my penis becomes hard. Recently, I had an intercourse with her during which she experienced many orgasms and I ejaculated in her vagina twice in half an hour. Both of us are healthy and fully satisfied but I do not want her to become pregnant. She is a widow. Please advise.