I would take "stress relief" to mean "happy ending"
That's the bit I don't understand.
Why come out with euphemisms for HE and then state that they don't offer sexual services?
Someone could genuinely go there for just a massage and find that they're being offered something they don't want.
Or a punter has the awkwardness of asking for the extras when the website says there are no sexual services.
How is a customer/punter supposed to know?