Don't be fooled by the title, because Sweetest Taboo has nothing to do with incestuous relationships. Actually, the title has nothing to do with the entire feature, which seems more like a compilation than a feature.
Desiree Lane takes Kimberly Carson and another girl for a ride in a Winnebago in search of sun, fun and a multitude of male members. But when they stop for gas, Ginger Lynn has replaced Carson. Lynn doesn't appear again until near the end, when Lane is flashing back to losing her virginity to Paul Thomas just before he steals her R.V. The scenes with Lynn appear to be original footage, while the Carson's scenes look like fillers to stretch the tape's running time. Also, the Carson-accompanied trio watch two loops on a portable VCR in the R.V. that are also added to increase tape length, but they're not very good.
Sexually there are some bright spots, like Lane's first time with Thomas in the "Winnie," and the double pairing at the R.V. campsite. Also, our main characters stumble upon two other couples at the same campsite in the middle of something that really looks hot! But we don't get to see enough before the tape's ending. This incompleteness can be felt throughout the entire tape, and makes it difficult to maintain any sexual or entertainment continuity.