100% of a sexually active subset of people is sexually active.

that group of 100% sexually active people is twice as likely to be sexually active than heterosexual teens.

therefore, heterosexual teens are 50% likely to be sexually active.


oh, and, at least one same-sex or bisexual person is sexually active (needed to ensure that there exists a non-trivial subset of people who engage in same-sex or bisexual activity).


i think that covers it.