It's safe to say that Megan Fox and Machine Gun Kelly are pretty ~out~ there when it comes to being open about their relationship. From wearing each other's blood around their necks (yep, really) to all that v steamy PDA, and let's not forget their monologue about flesh and tantric night terrors too. It seems strange then that in their latest interview with British GQ Style, Megan made her boyfriend stay tight-lipped over what seemed like a rather tame topic.

Appearing on British GQ Style's online The Couples Quiz series, the pair took it in turns asking each other various questions. But, when the 35-year-old asked MGK what her favourite way to decompress is, you could quite literally see the instant regret flash across her face.

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"Do you want to tell them what the doctor said?" the musician joked, before Megan butted in with, "You are insane. We cannot say that on camera. That's your favourite way for me to decompress after a stressful day. What's my favourite way to decompress after a stressful day?"

Clearly getting his girlfriend's hint, MGK started listing off drinking tea, foot massages, TV and having a good cry as a few of Megan's favourite ways to decompress. But, the couple couldn't shift the elephant in the room, and ended up circling back to the question before the end of the clip.

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"Do you want to tell the people what the doctor said?" Megan asked, to which her boyfriend replied "Look, the doctor said, every day Megan has to…" But, the actor quickly cut him off (again), meaning we'll never really know the answer to that one.

Although, if we had to guess, we reckon it starts with O, and ends in RGASM. Thoughts?