The typical clientele are middle aged women with a lot of money and husbands beginning to lose interest in their partners. I also do sports injuries and those clients tend to be considerably younger. Over a long time doing this yes there are some women who have hinted or directly asked if i would be willing to satisfy their arousal. I was originally happily married and tended to refuse politely. This changed when i was single again and I at times did set out to purposefully arouse women i found attractive. Treatment rooms are not sound insulated and though quite private it is risky bringing a women to orgasm with others about. I have done it many times but I have to get the woman to agree to do it as quietly as possible. Choosing the loudest covering music is one good trick
In several cases the women have subsequently asked for meetings outside work or massage at home - I at that time offered a travelling service as premises were exhorbitant.
For those more difficult cases in the massage spa the technique used in the majority of cases was a version of g spot massage - thumb outside on clitoris - 2-3 fingers slid inside and alternating between deeper thrusts and vigorous downward pressure on the g spot. Often this led to an orgasm with squirting and a major vaginal spasming - one solicitor who was especially tight nearly broke my fingers at orgasm the spasms were so ferocious. yes it is very arousing to witness too
I see it as a privilege - a perk - yes some have become lovers for a short period. It is quite uncommon - not the norm but it does happen and there are things that a masseur can do to make it more likely so to speak.
If your own partner loves massages dont be too hard on her - many choose men as we can give a much more firm massage. It is probably not true that she is being made to come. Then again you know your partners best i expect