Has the chemistry of your relationship suddenly changed? There’s a familiarity that comes with regular sex with your lover. Adding a third person to this mix can affect the chemistry of the sex in your relationship. Are you bumping heads when you lean into kiss? Are you finding that your partner just isn’t getting aroused by the same things anymore? This is more of an intuition thing, but if you feel that for some reason things are just “off” in your sexual relations, there may be something else going on.