No - if all parties are heterosexual.

Yes - if the initiating partner is bi sexual and the third party is homosexual corresponding to the first party's sex.

I've done this and it was great; the bisexual girlfriend had everything she wanted at once and there were no issues between me and the lesbian partner.

But I just don't want to suck a guy off thanks anyway and his cock up my arse and in my partner in the same session - uhh no!

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Vigil, if you were my husband, I would give you poison.

Madam, if you were my wife, I would take it.