It is not the sex, if you really have the intention of learning something eg: languages, mathematics, science, culture or religion. You don’t need to have a male teacher to educate above mentioned things it can’t be either male or female teacher. Well most of my teachers were female during my school life. It doesn’t mean that they can’t teach. Well most them like to talk with an opposite sex unless he/she is a gay. As I mentioned earlier if you really like to build a friendship, the sex (male/female) won’t be a problem. I do like to talk with a girl :)