Yeah, I imagine they snuck out a few times.. not too far or anything, but they're allowed to leave camp. Henry just usually doesn't since he wants to be around for Jenny or in case any of the goons need him (although they also at least still have Rainer), so his absence is extremely noticed during these times. I imagine they fucked quite a bit too especially cos their relationship is very.. rushed into? and they don't really know each other at all? Just kinda one of those dynamics where they don't truly know what to talk about even though they want to be around each other-- so they were probably hardcore honeymooning and doing it fairly often as a way to spend time together without having to actually talk. Something Henry will later reflect on when he realizes they probably weren't long-term compatible / that he's not even sure if he really truly loved her in that way, because well, he didn't really know her either.