Here are a few words from Chelsea Girl about the prospect of a threesome:

This is the story of being the girlmeat in a boybread sandwich.

…

In the grand spirit of nothing exceeding like excess, the threesome promises a surfeit of pleasures. More hands, more mouths, more flesh, more limbs, and, in this case, more cocks. I’d had the girl/boy/girl threesome a couple of times–and in fact the week after my boy/girl/boy threesome I’d have another g/b/g one–but I’d never been with two boys at once, and I liked the idea.

I liked the idea of being the warm womanly center of the all male maelstrom. I liked too the idea of being doubly objectified, doubly penetrated, doubly used and doubly pleasured. I liked the idea of having a cock in my mouth while a mouth was at my pussy, and while that scenario is obviously open to the g/b/g threesome, I liked the idea that I could then be fucked by the cock belonging to the mouth that was at my pussy.

I didn’t really think a lot about the boys kissing, touching or whatever together. It would be exciting–I like hot boy-on-boy action as much as the next sexually progressive chick–but it hadn’t really entered into my fantasy extensively, to be honest. Mostly this fantasy centered on me, my body, and those two boys who would in tandem be doing their utmost to pleasure it.

Of course, as is the way of things, the reality was a little different than the anticipation.