In my opinion sex in a committed relationship allows for the exchange of energy to move more easily beyond satisfying orange ray urges. Having sex with partners who you do not have green ray or higher connection to often leads to orange ray transfers that can be one sided and lead to attachments that can bring about negative emotions.
Plus the more you have sex with one partner the closer you become and the more satisfying and powerful your sexual energy exchanges become, moving up from green ray exchanges to blue, indigo and violet. By having sex with multiple partners it would be more difficult to build up that rapport as you are spreading your sexual energy around rather than focusing it on one relationship.
From what I understand/assume about full fusion exchanges these only really occur between twin flames, who know every single thing about their partner since they are essentially the same person in the opposite sexual polarity, and as such are able to merge themselves completely.
Plus the more you have sex with one partner the closer you become and the more satisfying and powerful your sexual energy exchanges become, moving up from green ray exchanges to blue, indigo and violet. By having sex with multiple partners it would be more difficult to build up that rapport as you are spreading your sexual energy around rather than focusing it on one relationship.
From what I understand/assume about full fusion exchanges these only really occur between twin flames, who know every single thing about their partner since they are essentially the same person in the opposite sexual polarity, and as such are able to merge themselves completely.