An Evolving Sexual Orientation

When my wife was in her late 30's, her vagina became very dry.
It didn't matter how much lube we used, taking my thick 7 inch cock became too painful for her.
She continued to blow me, but I needed more.
I travel a lot and am usually way 2 or 3 nights at a time.
I started to pick up random women in expensive bars and so usually one or two of the nights away became hot sexual encounters. Some very hot.
A turning point in my sexuality came one night when the woman I hooked up with suggested we went to her apartment only a block away.
When we got there, we were not alone.
A mid 30's guy was in the living room having a glass of wine.
He nonchalantly offered to get us both one.
When he was in the kitchen, she confessed that both she and her boyfriend were bi and that he got really turned on watching her being fucked, or making out with other women.
I had enjoyed a few drinks and was actually turned on myself, with the thought of a hot guy watching me fuck his girlfriend.
We didn't drink the wine.
She dropped to her knees and took my cock out and started to blow me. Her boyfriend dropped his robe and started masturbating, just a few feet from us.
It wasn't long before she and I were nude on the bed making out. He stood by the bed very close working his cock,
We made out. I went down on her smooth c**t and he leaned in so she could take his cock down her throat.
I needed to fuck her so pulled my mouth off her c**t and slide between her thighs. He pulled his cock out and watched me enter her and start fucking.
All he could say was oh yeah, fuck that hot pussy...
I did. Long and hard while he purred and continued masturbating
Then he softly slide his finger down my trench.
I was close to ejaculating and the sensation of feeling his finger in my trench, massaging my anus made me explode.
I kept fucking as he started to open my anus. Working his fingers and tongue. I drove me crazy.
I pulled out of her.
He wants to fuck you she said.
He lubed his cock and did.
Me on my knees, my arse in the air and my mouth on her wet cummy c**t.
I was totally out of control.
We spent the night together...sucking fucking and making out.
I get to stay over with them about once a month and it is amazing.
In addition I have started hitting on guys and have become totally obsessed with cocks and hot arses.
I still fuck random women but I am really starting to have a preference for younger studs.