Sleep, sleep, yes, many times, with one of my best friends (who is a woman) 
but fuck, no, never. I have always known women are not for me (from the sexual point of view!).
Have you ever participated in a threesome with a man and a woman, yes or no?
I prefer long term relationships
Have you ever had two relationships at the same time, yes or no?
Yes, I did have sex with my boyfriend in the bathroom of a plane to London Spectacular, I have never felt so excited in a public place!
Have you sucked someone while the guy is having a work videoconference? 
Yes, a lot! My boyfriend is a doctor at a hospital in Madrid, so we roleplay all the time he being a doctor and me being his patient
Have you participated in couples exchange (swingers)?
Yes, once, with an ex-friend and it was very hot!
Have you ever fucked (or been fucked) on a nudist beach?
Nope, never Have you? How did it feel?
Have you ever fucked (been fucked) on the street, in front of others?
@dvt
Yes, many times. Especially when I brought a boyfriend home and I was sleeping next to my parents room
Have you ever fucked (or being fucked) on your parents' bed?
It depends on how horny we are but most of the times bed.
Fucking on the working desk or on the kitchen table?
Longer, not to suffer too much when being fucked but thicker when sucking
Eating cum or spitting it?
Actually I love both With my boyfriend we practice snowballing very often
Cumming inside the guy's ass or on his back?
I love to cum, so I would say cum multiple times a day/week
Always cleaning inside before fucking or prefer to "improvise" and fuck without cleaning?
Both... always starting with regular photos and then nudes
Fucking the fist time you date a guy or not?