Swingers having sex and build no commitment sex relationship, but their sex more than sex and more than just frequency. Swingers sex is also having great sex. If they use the same sex position all the time they might not have great sex.
If they use the same sex position all the time sooner or later the sex would turn into boring activity. Sex to stay fun and make it great sex needs to stay interesting. The easiest way to make it interesting is the variety.
Everyone can have great sex with variety of sex partners, because there are no two sex partners are the same. They might do things different way. One might be better oral sex partner then the other. Some others might love to have sex in different sex positions.
There are unlimited sex positions and everyone can create a new sex position with a little fantasy. However all
sex position based on 6 basic set up, all others are the variations of the six.
The six basic are: Man on the top, woman on the top, doggy style, sitting, standing, side by side.