Think ghost busters and the streams should never cross. Sometimes, kink and vanilla worlds should not cross.

Some guys might be bdsm kinky and have been thinking about sessions and play since they were 15, so that could be at least 15 years if not more. So then, the kinky guy approaches the GF and wants her to join in. And everything they talk about it total sticker shock. She might have dominant tendencies but she's not kinky in the bedroom. So her kink IQ is that of a complete newbie and the guy's kink IQ is genius level.

It's not the guys fault or her fault that she's not kinky.

And then if she's dragged into a session, she's watching her BF, or husband, or father of her children in situations that she's completely not prepared for. A straight girl scout woman is not going to be prepared to watch her husband and father of her children be tied to a spanking bench and caned. It's just not realistic.

I'm not trying to be a wet blanket but there's enough indicators and triggers floating out there in society, and if she was so inclined, she would have been likely doing it by now.

My recommendation is to not cross the streams.