Lynn,
I just assumed that Dan invited Clark in order to (a) show off that he'd "won" in the battle for Lois and (b) maybe one-up Clark on the slopes. (Male competitiveness and all - why they think this impresses women, who knows?)
I thought Clark accepted the plan because he thought by his presence he could come between the two. If he *doesn't* go, they'll probably end up sleeping together, but if he goes, maybe he can throw a wrench in the works.
Anyway, based on these two assumptions, it seemed believable to me for Dan to invite Clark, and for Clark to accept. (For what it's worth.) But if you feel it's necessary to explain their actions further, that's OK, too.
- Vicki
