Oh, so this mysterious person does get to have sex 3 or 4 times a week? That's pretty damn good. Personally, I'd love to have sex every day, and only get to have it about 3-4 times a week. My only suggestion, from personal experience, is, make those 3 or 4 times with a partner(s) as good as possible, and get better at masturbation.
I think fuck buddies count as a relationship, myself. 2 people relating to each other, even if it's mostly sexual.... still a relationship.
Maybe find a nice cybersex partner as well... it can be a bit more fun than just doing it alone.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags (poly, F, 60) loving miss pixi (poly, F, 38) since January 2009, living together since 2013
also loving Punk (monogamish, former swinger, 42, M) since Oct 2015
"Master," (mono, 34), miss pixi's Dom for 2 years