When your big sister catches you spying on her having sex with her boyfriend, she isn't remotely upset. She understands that boys like you are curious, and the idea of you snooping around excites her. She decides that the best way to educate you is to let you keep watching, but believes that hands-on experience is the only way for you to ever learn about women's bodies. After she's had her fill of her boyfriend, she urges you to lose your virginity to her while he watches the two of you commit the ultimate taboo. Viewer discretion advised.