I know it's an old thread, but from what I understand of the professional massage world this exact line of thought/action can easily get you sued and even have criminal charges filed against you in the business of the massage world.
Honestly, is that risk worth it?
There's plenty of ways you can get around that, but the bottom line is if you are accepting money and something sexual goes on it can blowback on both the business and you personally.
Learn the difference between sexuality and sensuality and you can be really sensual in the massage with totally innocent/neutral intent and leave the door open for them to come on to you. Just make them feel good man, do what the other guy said about the eye contact and body language.
If someone was really interested in a client and wanted to turn it sexual, they'd have to be really careful about it being a non-paid transaction.
For everyone not actually licensed, none of this applies. Massage anyone you'd like as dirty as you like. And for those licensed, you only have to watch out in your place of business and/or if it's a client-professional relation. That's really different than personal relations.
Source:
Looking into becoming a licensed massage therapist myself
reading from
http://www.male-massage-therapist.com/