Me and my friend were double dating and her and her boyfriend got hot and heavy in the backseat of my car?

totally rude and obnxious or what? i deided to be nice and give them a lift back home since neither of them have cars. but as soon as we got in the car, they climbed in the backseat and started making out passionately. they were like laying on top of each other, pratically having sex with their clothes on. i could hear the kissy sounds . I was the designated driver, and my boyfriend was in the passenger seat and we acted normal not like two love sick horny teenagers. (we're all in our 20's). then beforehand, we had went to a restaurant and they were kissing... and my friend she was like " baby i want you covered in chocalate"- she said this to her boyrfriend. ughhh i swear im never doing this double dating thing again since they dont know how to act appropriately