Twins (2008)

Real twins Lyndsey and Lacey, identical in nearly every way except for their sexual preferences. Lacey decides that Lyndsey should join the fun and sets out to give her some good lessons on lesbian sex. An all-star cast makes the household a great place for young Lyndsey to learn. Maybe you can learn a thing or two as well, and if not, at least you'll see sexy ladies get off.