If you know the message therapist offers this service what is the best way of requesting it from them? Because a lot of them are fearful that you might be LE, is there a proper etiquette of way of asking them without offending them?

I take her hand, put it on my cock and say "please".
Usually she will notice if you are forming a tent under the towel, so I don't always have to ask.

I sing a song about this very thing

xoxo

Donna Summer

If you are sure she offers a Happy Ending...  whisper "you are turning me on"  or  "that feels so good..."
skb

and only if you are sure, you can let her know you are interested, then let her lead the way.  If that is what she is in business for she will know how to get you there.

While you are face down, when she gets to your upper thighs, spread your legs just a bit.  Enough to allow her access, but not giving her a gaping ass shot.  As she walks around the table near your head let your hand caress her calf just a bit.

If she isn't interested she will let you know in no uncertain terms, if she is then you have done your part and she will know how to take it from there.

I enjoy a great FBSM...  
In my experience, a non-FBSM will keep you covered.  While you are face down, will NOT go deep between your upper thighs or brush the boys.  If a masseuse is doing these things it is no accident...  let her know you are enjoying it...  (If she has not already defined the limits, that is)  She'll take over...
skb

You are correct I use to work in a Studio that advertised for massages a few years ago and those were some of the signs we would look for. Any kinda of movement when we go near the boys.

When I got my last massage, i undress myself but i wore my underwear. Should I have just stripped naked completely and perhaps that would hint to her that I want it? She was touching my inner tights and humming but I just lay there like a dead fish didn't touch her or do anything. So if I wanted the hj the best thing was to hint at the massager? I shouldn't just assume that she would do it?

what do you mean by how she moans?

LOL@taking her hand and saying please. I couldn't stop laughing after reading that.

One other thing you can do to let her know you want some relief is let her know you are ready for the flip lol

sure indicates if you are "open" to a HE or not.  I've had LMT massages & left underwear on....  at a doctor's office for goodness sake...  
FBSM...  on the other hand...  clothes all on the chair...
skb

Personally, I like to let me forearms (from the elbow down) flop off the edge of the massage table.  This gives the girl a chance to brush by my hands.  If she does let her legs brush by forearms or hands - I will do the little pinky twitch and work my way up to feeling her leg.  Once you are feeling her leg like that, she will take over.

Also always strip down to your birthday suit.  Even legit massages are normally buck naked covered with towel.  Also when she gets to your legs, give her some encouragement.  When she gets to the right general area, say "Ah, that feels really nice" or "you have great hands"