Should i stop inviting my friends to social gatherings since they don't know how to act appopriate in public?

i invited my friend and her boyfriend to my birthday dinner.and then invited a few other friends to tag a long. My friend's boyfriend ask the waiter " would you ever be a porn star"? and then like a hour later him and my friend start making out at the table, right in front of us. then her boyfriend goes " baby i want you covered in chocalate". good grief. i gave them a lift back home since neither of them have cars, and they jumped in the backseat layed down in the sex posisition and started making out passionately. thank god they were fully clothed or i might have had to latch out at someone