I think it was either a therapist or a lawyer.

I have someone Patricia Arquette like in mind for the woman. I think it was a largely sex themed comedy or dramedy. For some reason I remember that sex scene, probably “doggy stile”. (Definitely a mainstream movie and not some softcore nonsense)
I probably didn’t saw the whole movie though.

PS:

I’m ordered to register an account, yet It’s impossible to log in. No matter how many times I submit the login form the website still displays the login link.

Hi!

I vaguely remember this scene, where some young guys were having the contest to kiss (?) the girl or something. And unexpectedly some dumb guy joined and swam so long that they thought he drowned at first.

It is likely a really old movie. I also seem (that part of the movie) takes place on a ship.

The may be unconscious when she shoots him, I’m unsure.

(I’m logged in but the site still ask for my email, and saving my username/mail)