When I was younger, I used to have friend that came over to my house and we would play 'grown-ups'. I would pretend to be the 'husband' and she would be the wife. We would pretend that I would leave for work in the morning and before leaving I'd ask the 'wife'; 'Are we having sex tonight?' upon which she would reply 'Yes'.
Pretending to return home from work we would get on my bed and I would get on top of her and we would roll around pretending to kiss each other and pretend to have sex. Of course back then we assumed having sex was just about rolling about on the bed together and didn't really know the real meaning of it.
I don't consider myself bi but thinking about this memory has often turned me on resulting in me masturbating. I often wonder what it would have been like if we had gone further and really kissed each other or even touched each others pussies and made each other wet and cum.
I imagine what it would be like if we did that now and the experience of being with another woman and seeing her naked, squeezing her breasts. I also think about what it would be like to finger another womans pussy making her moan with ecstasy and what it would be like to stick my tongue in there and lick her clit furiously until she cums on my tongue. I'm horny now just thinking about wanting to revisit my memory!