Allow me to put in my 2 cents.
if you currently go to your favorite mpa for fun/release, and you're happy/satisfied, then don't worry about DT massage. just enjoy yourself as is.
I'm an older guy and belong to YMMV class. not every encounter was ideal. regular or mechanical HJ isn't interesting anymore. especially with early release than expected. so I decided to try Dragon Tendon massage therapy.
I was told at least 1 treatment plan (3 visits) to see real benefits. the night of the first visit, I felt immediate warmth on the manhood and desire for action. I checked the time and lasted a few extra minutes.
if you're curious, just try it once to get a feel. you might feel slight pain during treatment, but easily overcome by the immemse release.
I had Michelle (formerly at G101) from the beginning. She only provides treatment with optional HJ. Ex Annie from G101 required 'fasting' I.e. no release for 3 days, but did offer nude option. Not sure if she is Selena at SL.