My kids and I walked in on a couple having sex

I have a 4 yo and 6 yo (boys). So far, we've been taking the sex ed part of their upbringing by their lead and I feel we've been doing great in this regard. We've been answering questions (like: so mum, when I was in your tummy, how did I come out? Was it like you were throwing up or pooping?) as factual and honest as possible. My kids now know the basics of how babies come to be, the anatomy of women and men, know about couples and marriage and people being gay and transgender, about how private parts are private, about how if you feel like touching your privates you do so in the privacy of your bedroom, and so on. They do not know about concepts like lust and falling in love (well we've been over that last one but I don't feel they quit grasp that concept yet).So we're on a camping trip and a couple of days earlier I was taking my kids to the shower. We went for the 'family shower', a larger shower boot with 2 shower heads and a baby bath. As I opened the door there was a couple (I guess around 18) having sex on the table with the baby bath. My kids got a full view. I handled it horribly and I'm quit ashamed of myself.First I apologized and threw the door shut. Then I thought, why the hell am I apologizing to these people having sex in the family shower with the door unlocked. So I screamed: lock the door you idiots!. I then took my kids to a small shower booth and continued what we came for. My kids deemed it necessary to act out what they just saw and started giving each other fake, loud kisses while dry humping each other and making moaning sounds. I was in shock and begged them to stop and tried to distract them. At least the noice scared the couple away. So far, we haven't revisited the subject, apart from getting them to stop dry humping each other in public. I think I need to have a conversation with them (if anything, I at least need the public dry humping to stop :/), but I'm at a loss where to even start. Any input on that is greatly appreciated!! via /r/Parenting http://ift.tt/2uDHqoY