in the u.s. , we have an expression "skeletons in the closet" which might at least partially adress what you're talking about.

Haha, Danny. I'll join in with some cheesy lines. They held hands while looking up to the stars. Moment before they shared their deepest desires with eachother. Their secret fantasies had all come true, the air was filled with passion and romance. This was a night neither of them would ever forget. How's that for cheesy. :P

Depending on context, some of the following may work (and apologies for the bad romance style writing, I never was a good romance author :) ... 'innermost secrets' e.g.: The night they met was a whirlwind of romance. Even before the end of dinner, they had shared their innermost secrets. 'to (lay) bare one's soul' e.g.: He wanted her to understand his essence, why he was, who he was; he bared his soul to her, showed her the essence of his being... Enough of the schmaltzy romance, I'm going back to my dictionary :)