There’s still an expectation when you stay in your parent’s home that hanky panky is off limits. It’s considered disrespectful to your parents, especially if they’re the parents of the wife. Like passive yes it’s expected that an adult couple (or even a teenage one) will have sex, but it’s absolutely a matter of TPO (time, place, occasion). Like just because you probably CAN get away with fucking on the down low at the Family BBQ, everyone is still gonna give you the stink eye if they find out and you probably won’t be invited to the next one.