i think threesomes are only safe when everyone is single (or have yet to have made any mental attachments)...maybe it's just me, but i would feel awkward if i was doing something with some guy my friend was into, or have one of my friends doing something with a guy i was into...it would be really strange and there's no sort of win win situation for the guy if one of the girls genuinely likes you...unless you let them dike it out and you just fuck the one that likes you. worked for me 
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There are many here among us that think life is but a joke
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