Lemain - I absolutely do not have sex with clients. While I have connections with girls (and boys) who do that and I do not judge, I'm personally not comfortable with it as I'm gay. I remain fully clothed at all times, though clients usually undress. I might touch their genitals at some point, but only for sadistic purposes - i.e. CBT (cock and ball torture). Pegging and anal play is quite common though. I'll always use condoms and gloves.
Loveka - Most clients don't orgasm. There are many domes who don't allow it. While it's still sexual, I don't perform traditional sexual acts, though may engage in pegging. It's arousing on a much different level and for some clients may not be sexual at all. It may be a comfort, or a release, or just plain fun.
DailyMailPaper - See above for your first question. It is incredibly arousing for most clients, and I may allow them to masturbate to finishing, but orgasming doesn't usually happen. If it does I'm certainly not assisting by touching them. Usually I guess it's stored in the 'wank bank' :D
Yes I will discuss the nature of the session beforehand and approximate timings. Of course, there may times when they don't like it and we have to think of something else, or they want more of something. I'll allow five or ten minutes towards the end to 'cool down' and bring them back to reality. Especially if they enter 'subspace' (A kind of...trance I guess?). We also have a 10 minute debrief after the session. Don't be sorry. Happy to answer.
Stego - I work either at my home (If I've seen them before - I live with kink-friendly fuck-off big flatmates, so I feel safe, or at a dungeon, though that costs extra. I don't do outcalls as it doesn't feel safe.
Pinstripe - I don't sell them on amazon, I have a wishlist of items that clients and 'fans' buy me. Anything from floggers to a slow-cooker :D I sell tights/socks/pants to clients through my personal page. I'm purely word-of-mouth and don't have a website.
Starlight - I tend to say 'RACK' when I'm talking about consent. Risk Aware Consensual Kink. There are things in kink which are not safe. I would never practise breath play as it's just too dangerous for me. I don't practise complicated rope on clients as I'm not skilled enough yet. Kink is about knowing what the risks are and minimising them, not pretending they don't exist. For example, if I'm caning someone, and I hit their kidneys, they could get incredibly hurt. It's not a sefe activity. There's the risk of breaking skin. Instead of just not caning someone because it's not safe, I practise my aim, I 'warm up' the skin, I check for blood, I disinfect my toys. SSC vs RACK is a pretty hot topic.
As for the sub being in control...in a way. Although again I would question that. Yes, if they 'safeword' (I use a traffic light system) then I'll stop or check in. They have the power to end the scene. But ultimately I believe the power is mine, especially if I'm playing for fun. I decide what to do with them, within negotiated boundaries, and ultimately if something goes wrong then I will take responsibility. Subs are not always in control of their though processes during a scene. They might be trying to 'push themselves', they might go in to trance, they might feel uncomfortable speaking up. It's up to me to check on body language and care for them. I know if I ever 'bottom' then I will agree to things I wouldn't normally during a scene as go 'spacey'. So yes and no I guess.
Sorry super long, I'm a thinker!