I think it's obvious that "rolling around naked" doesn't have to mean that they LITERALLY "roll" around. It is a euphemism for "cuddling" naked or "intimate nudity" (instead of non-sexual "recreational" nudity, such as skinny-dipping). I think it's less sugar-coated and perhaps more crude-sounding than "cuddling", but it basically means the same thing.
As far as I'm concerned, you don't OWE others an explanation that they can "handle" when it comes to whether they'll accept your poly lifestyle choices and how you express yourselves within them, so you don't have to "rethink their relationship" for other people's benefit.
Sorry about the excessive use of quotations; i'm not doing that to sound adversarial, i'm doing it to denote specific terminologies.