No reason to be self-conscious. Your SO should be happy that you have a boyfriend whose libido matches yours and can take care of you.
We started with my boyfriend Red living a few houses away, then moving in, now we have what my husband David calls "our compound," it's a big house with a guest house that is Red's, now connected by a breezeway. Mostly because Red is a creative type that has always worked from home, while David, Lora, Clair (before she became our full-time, stay-at-home mom), and I have corporate office jobs. Although Red used to spend more nonworking hours there, since the kids he's with us all the time now.
David and Red have totally different personalities and values as well, but they get along perfectly, like they appreciate the ying/yang thing of each other. They share not only us women between them (so much for male jealousy), but things like tools, electronics, their cars.
The guy I call my "boyfriend" now, Red, was my fiance with whom I broke off the engagement but never broke off the relationship, sexual or otherwise. (He is a "creative" type who I though would never make much money and wouldn't make a suitable partner; ultimately, I was wrong about both.) David is the guy I met shortly thereafter, started dating and starting having sex with. He was totally relaxed with me still seeing (and yes, fucking) Red and asked me to marry him, which I did. My Lesbian side and Clair and Lora joining s came later.