Meaningless from whose perspective? If a partner of mine cheated on me (yes, it happened) it wouldn't be "meaningless" to me. It would mean that they had breached my trust and I would have to think carefully as to whether it could be resurrected. The fact that they told me it was "meaningless" would be worth the same as their promise to be faithful-that is, it would be worth nothing. It didn't mean anything I was drunk S/he really came on to me I was so horny and you were out of town are crocks of shit. Being faithful is like being pregnant. You either are, or you are not. No grey areas. On the other hand, as other posters have noted, if your partner/s know of and are OK with extra sexual activity, go for it. But in that event there is no breach of trust. Hell, if your partner wants to video you while you do the Dallas Cheerleaders in the butt, more power to you both!