Hi and welcome to our caring community ES;
It's great you've plucked up the courage to ask for advice and tell a little of your story to us here on BB. Your query is unique and one I'd like to explore with you if that's ok.
The first thing that puzzled me was; what prompted this issue to come to the surface? If you've never been attracted to the opposite sex, why now? Does it have anything to do with having children?
Being inquisitive isn't a crime; having a fantasy and then acting it out isn't a new idea. I get it. If you speak to anyone who has, you might find it isn't always as exciting as it's cracked up to be. There's a lot of disappointed people out there including me.
But...you don't know until you try yeah? Acting on your fantasy might best be done with a friend; someone you know, 'trust' and inclusive of your desire to experience something new.
I was approached by a good friend in my 20's to explore a technique he'd wanted to ask his ex's to do but couldn't. I identify as Bi so the prospect was considered. We talked extensively about it and set about preparing. A candle lit dinner at home, wine, laughter and then slowly we became intimate.
For both of us it was like being in a science lab! lol Talk about a let down! Afterwards we decided to stay friends and put it in the past...friends can do that if they're open.
I want you to be safe first and foremost. Prepare a safe environment and have an exit plan which includes your partner so there's no conflict or unexpected 'consent' issues. This is really important hun.
Considering your partners feelings is important too. They need to be respected just as you do ok.
Please keep in touch as I'd be glad to engage.