<qa>  What is the primary objective of tenofovir gel and film?This is an open label comparative study of tenofovir gel and film in 10 healthy sexually active women without active female genital tract disorders. The women will receive a single dose of each formulation - tenofovir gel 1;equivalent to 40 mg in 4mls of gel and tenofovir film 1.3;40 mg - in a crossover study design to determine the pharmacokinetics of tenofovir in the blood, cervical tissue, and cervicovaginal fluid primary objective. 