It wasn't until the sex happened that I questioned my sexuality.
Our oldest friends and my wife, Barbara, and I were always physically attracted to one another...heterosexually. There were times that a threesome or foursome took place. Like the time Barb, and myself and my friend Bob were on the living room floor, naked, with his wife, Linda, watching on the couch. After many drinks Bob pulled Barb's arms over her head while I had my way with her. I was expecting us to reverse positions but it didn't happen. It wasn't until later that he told me why. He had had sex with his wife right before and was "depleted". Too soon. Too bad. I wanted to watch that happen. Being depleted myself I never made a move on Linda...then.
She and I had had many opportunities to consummate our friendship but only came close, she reaching down my pants jerking me off and me fingering her down in her panties. I loved her butt. It was perfectly shaped and a nice size for her being a somewhat petite woman. Rubbing my hands over it's bareness was a joy. She and I came very close to going all the way but never did. I thought that Bob wanted to keep things as a foursome but that was not entirely the case.
Over the years it turned out that he and Barb were also taking every opportunity to engage in whatever sexual activity they could behind the scenes while Linda and I did our thing. Right from the start he had his eyes on Barb. She is an attractive, feminine, beautiful woman. It didn't bother me that Bob and Barb were going at it. Then, one day, the two of them were upstairs supposedly showering. I went up to get something and heard moaning sounds. Very quietly, I cracked the door and looked in the room and saw both naked and Barb going down on him. She had him deep in her mouth, cupping his balls in her hand. I got the largest hard on of all time as I watched. Then he turned her over on her back, spread her legs and started moving in and out of her. It did not take him long to shoot his load. The two of them looked like their bodies were made for each other.
That same afternoon, Linda and I found ourselves upstairs. I walked into her bedroom and saw her with a towel wrapped around her. I took it off. My clothes came off quickly and I pushed her down on the bed. Spreading her legs, I went inside her. I could not believe how wonderful she felt. It was as if WE were made for each other. She wrapped her legs around mine and pulled me close with her hands on my butt. I went deeper and she almost screamed. Bob and Barb were on the porch so they wouldn't have heard anyway. Her cunt felt like heaven and I climaxed quickly.