Speaking of primates, humans might have bigger genitalia than other primates but the champions when it comes to "getting some", are Bonobo chimps, found in the Congo. In fact they spend a lot of their time having sex, which is used for social bonding, greetings, conflict resolution and reconciliation. Bonobos are very docile towards each other, never agressive or murderous like the common chimpanzee. They also possess many of the psychological traits we value most, including altruism, compassion, empathy, kindness, patience and sensitivity.
"... Then there is the sex. Bonobos are famous for it. Aside from the typical male/female activity, they also engage in more "creative" behaviours: wet kissing, masturbation, oral sex, female/female and male/male couplings, group activities, the list goes on and on."
"When communities of bonobos from different areas of a forest meet, the females of each tribe initiate sex with males from the other. When chimp tribes meet, the encounters are extremely violent and it isn't unusual for at least a few individuals to end up mauled or even dead."
Make love not war, release your inner Bonobo!