Morning Gigi
It has been mentioned about Gideon being involved in BDSM, I'm not so sure myself. I think he may have dabbled, out of curiosity, to perhaps gain control back in his life, regarding s+x.
When they were having their chat in his home office, after the garden party, Eva said he was crazy if he thought he could order her around s*xually. His reply was"come on Eva. You know I don't want to beat you, punish you, demean you, or order you around like a pet. Those aren't needs either of us has." I just think he dipped his toe in the water, in his younger days. He needed control of his life back, in all ways, s*x included.
As for the limo ride, you hit the nail on the head, when you said about there being healthy ways to discuss the issue. Whenever they reach a crisis, they never step back and look at the situation. They just jump in all guns blazing! No pun intended, Gideon! Unfortunately those demon twins rear their ugly heads all the time.