In a 2000 article, Roy Baumeister proposed that sexuality varies fundamentally between women and men. Men, he suggested, have a fixed, biologically determined sex drive that is relatively insensitive to context. Women, on the other hand, have a much more variable sex drive, far more responsive to the surrounding circumstances. He based these conclusions on a broad range of empirical findings. According to this research, women have greater variation both in the level of sexual activity and choice of gender over time. Moreover, in women sexuality is far more influenced by cultural factors, such as education, religion, and peer and parental attitudes.