Oral sex....gal on gal or guy on gal?

Started watching a series on Showtime…The L Word…from a few (sh-t, almost 20!!) years ago. Found it just browsing and thought the “L' word referred to was ”love"….SURPRISE!!! Anyhow, really got into it - decent acting, production and interesting plot… and super hot ladies. About 6 episodes in, a guy who had just LEFT a gal he had married only hours before, was stopped for speeding by a cop. (If you want the details, watch the series.) He told the cop what had happened (he left her because he walked in on her being eaten by another lady). The cop launched into a lecture of sorts during which he basically said “Listen, when it comes to sex, guys cannot compete with women. The women own the equipment and they know how to use it.” Trite, but it got me thinking. Do girls who have had oral sex with both women and men prefer one to the other…and most importantly, WHY??!!??