Is it normal that i can hardly get off without a fantasy trigger?

Fill my wife for me to eat

I agree with Lord that it's great that you have the sort of relationship with your girlfriend that you felt able to share this fantasy with her. It's even cooler that she found the idea arousing too - and that she openly aditted it.

The fantasy isn't really uncommon, but the reasons behind it vary. For you, maybe it's about her being your private porn star, or perhaps it's the idea that you have a girlfriend who most men would find extremely sexually attractive. Or it could be due to the influence of the most ancient parts of our brains.

There seems to be a scientific consensus that our ancient female ancestors routinely mated with more than one male. There's evidence supporting this at the end of your penis.

The shape of the human glans penis is unique in the animal kingdom in that it has a ridge around the base. Experiements have shown that this shape is very good at removing any semen already in the vagina at the time of intercourse. So the ridged glans evolved because males who had one were more successful at producing offspring.

We all like to believe that we're more than mere animals, but the primitive parts of our brain influence us in ways we're not aware of, particularly when it comes to primal things like sex.

As for why she likes the fantasy, I suppose she could just be going along with it to make you happy, but having multiple male partners is fairly high on the list of favourite female fantasies. It could be because she's aroused by the idea of violating social mores and being a very "bad girl", or because she's turned on by the idea of being compeltely free sexually, or because she enjoys the thought of being so desirable sexually that she could drive a crowd of men wild with lust. Or maybe it's something else.

It might make things even hotter for you two if you were able to get to the bottom of why you each find the fantasy hot, and then talk to each other when you're having sex.

I had a girlfriend who was also into this fantasy. With her, all it took for her to come was for me to say at the right moment that I was holding her legs open for another guy to slide his dick into her.

Whatever floats your boat. It was cool that you shared this with your gf. Some women would have been offended because you couldn't get off with them only and not have to rely on a fantasy. Kudos to her.

Yes, making her cum, is what you want to do