Getting costs in most civil cases is no longer about making financial restitution - the litigants are usually so well funded it does not matter

cost awards indicate not only did the jury agree with you, but your case was so strong the other side should be punished for bringing it. Compare to cads where costs of a dollar are awarded.

As for sex, forswearing sex before a sporting match is / was a common means of getting teams away from disruptive or chaotic marriages by wiley coaches, and could be seen as a sunk cost in winning the match. Even if you were awarded restitution after the match the costs were sunk so it does not matter if costs are awarded or not (see the too well funded to care above)