Human partnership

I lie next to a fellow human
My partner
She is of the opposite sex to me
I wonder what it would be like to lie
Next to a man

I feel my body repulse a bit. What if that man
Was my dad or my bro
Why the repulsion?
There is something inbuilt in me that I would like
To lie next to the female form

I think of lying next to my mum
That is slightly repulsive
So it is not all females
How about my old maths teacher
Miss Oaten. No I would not like that

So maybe it is that she is a girl
My preferred and chosen girl
That makes lying next to her so special
I imagine lying next to another hot girl
Hmm that works

But then I imagine lying next to my preferred girl
My chosen girl after
No that doesn't work
It is the mutual trust
The fidelity that holds us togther

Would I want her to lie next to another guy
In an intimate way?
Maybe before when I didn't care about fidelity
But not now
No, I want her to myself