How does Human Sexuality manifest itself in each culture and how common is it?

You are asked to identify a specific sexual behavior and examine how it is practiced in two different contemporary cultures. You are free to select almost any sexual behavior that interests you. Examples of appropriate topics would include (but are not limited to) the following: kissing, homosexuality, marriage, oral sex, sexual violence, transgenderism, paraphilias (e.g., fetishes), contraception, masturbation, cheating, age of first intercourse, statutory rape, etc. After that, you should identify two modern cultures with differing views on the behavior and discuss the following points: How does the behavior manifest itself in each culture and how common is it? Why does each culture view the behavior differently (e.g., religious beliefs, tradition, superstition)?