My wife is bi, nothing to hide there. She told me however that she never had any real experiences with other women before, no girlfriend, no nothing. However, she said she used to have some "heavy make out sessions" with some of her friends. They used to get tipsy, get on top of each other and kiss aggressively. She says they didn't have sex, but I'm sure they were at least humping through clothes and I can't believe they didn't put a hand under each other's shirts..
I know my wife really likes larger breasts and finds some of her friends attractive. So, I'm sure she must have enjoyed those in the past. Sometimes we hump ourselves as foreplay and I keep thinking of how her past is coming back to light