Until now, my sister and I have never discussed our individual sexual activities with each other. Occasionally, she asks me questions about sex or things she's heard about at school and I answer her as best I can. A military father can be pretty strict, especially with a daughter, and Lisa was not allowed to date until she was 17. She is inexperienced and naive, and I'm pretty sure she's still a virgin. I always caution her about getting sexually active too fast. I've had a few girlfriends who have been willing to experiment, so I've eaten pussy, had blowjobs and fucked a few times. But at 18 years old,...