I'd have to say the majority of my clients are more concerned with me cumming then themselves. No, no, not because they are 'fluffies' but because it makes them feel good that they can. Luckily they all manage to, but there will be times when that does not happen going ahead. That will not necessarily be a reflection on them, our bodies are strange and for some reason, not matter how relaxed or tuned on we may be, sometimes we just can not let go.
Do I expect a client to focus on me? Hell no.