I was 15 at the time . My parents answered a few questions without being asked. During our school teaching of reproduction . Our teacher told us the the male would insert his p**** into the female . And thrust’s until he jaculates the sperm . A few students asked about the thrusting the teacher wouldn’t really answer only by saying nature will teach you about the thrusting . My parents part . I went to a birthday party for a friend one Sunday . We weren’t sure on the ending time . When I came home I found my parents having s** on their bed of course . Dad was on top like we were taught . His body was moving in and and out. Mom was pushing back against his thrusting . Perfect motion on timing . At one point she said f*** that p**** and said faster. Dad listened and his thrusting became faster . Her replied was oh yeah. Few minutes later he gave a moan and his thrusting had stopped . Thanks Mom and Dad