When you inhale your wife's lover's pheromones, your body is also processing the information about his genes.
In this respect it is similar to attitudes about extramarital sex now held by many of the younger people in Japan.
Now comes the fun part: you react to your wife's lover's pheromones too! His mind was filled with thoughts and images of what had been going on in their room whilst he had gone to pick up their suitcases.
At the same time, the hotwife does not want jealousy or resentment to ruin her marriage or threaten the unusual freedom she enjoys, a freedom she knows that very few husbands would be willing to grant.