Hmmm... various scenarios suggest themselves:

1. You and your colleague/girl friend go off for a naughty afternoon. After a couple of hours you phone hubby - darling, I'm in bed with **** - want to join us?

2. Over supper at home you say - darling, you remember we talked about an MFF threesome? Well, **** is up for it - what do you think?

Either scenario could end up as the most exciting threesome, or the most excruciating disaster. Which is more likely?

Beats me.

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Erotically yours... Gus