I'm not trying to be taboo here. It's a fact that there were a lot of different couples formed during the course of the series (due to couple swapping and emergence of 'flavor of the month' characters) and most of these couples did engage in coital activities. I know that people tend to be bias toward the couple/couples that they like most, so I'm asking the posters to set aside their biases for a while and just focus on the "sex" aspect of the relationship.
Ace Victor