On a site from the U.K. I see a sexual practice called Vanilla. What is it??

 

Vanilla sex is sometimes used as a derogative term that refers to what a society regards as standard or conventional sexual behavior. Different cultures, subcultures, and individuals have different ideas about what constitutes vanilla sex. Often it is interpreted as sex that does not involve such elements as BDSM, kink, or fetish activities. Among homosexual men it sometimes implies that the activity is non-insertive (i.e. intercrural intercourse(in which one partner places his penis between the other partner's thighs), manual sex, frottage etc.). Among heterosexual couples in the Western world, vanilla sex often refers to the missionary position. The term "vanilla" derives from the use of vanilla extract as the basic flavoring for ice cream, and by extension meaning "plain" or "conventional". Thus, the term "vanilla" is sometimes used as an insult to describe someone who is overly conventional or unwilling to take risks, in both sexual and non-sexual contexts.