My daughter and her partner

I reconnected with my daughter about 15 years ago. Her mother took her and disappeared when she was a year old so it has been Great getting to know her again. About 10 years ago she found her husband having an affair and divorced him. Within a couple of years she and an old girlfriend from high school moved in together and eventually got married to my surprise.

When I see them together I am fascinated by their love for each other. And I am so turned on. I keep trying to catch them making love, or just playing with each other. And being somewhat gender fluid I want to bring a bf into the mix. Anyone else have this situation. How do you handle the desire??