Though Sexuality in General May Be Difficult for Some People

Though sexuality in general may be difficult for some people to talk about, why is it almost impossible to ignore?

A) Because the internet is full of porn.
B) Because it is far too commonly found in the public school curricula.
C) Because people are always trying to force you to talk about sex.
D) Because there are many social and cultural messages out there about sexuality, including very subtle ones.