Welcome to fence-sitting 101. Nobody is at the top of their game here, but there's nothing wrong with the material either. The action - standard fucking and sucking - never reaches critical mass, though when it comes to youthful, all natural appeal, at least half the girls (such as Pureheart, Lei and D'Lovely) rise well above the standard.
The title has nothing to do with wife swapping, and the interiors tend to get repetitive/claustrophobic. With a little extra effort, it could become a worthwhile series. And isn't that what everybody wants?