Chrissy, I think the point of the question "how 'bout foolin' around?" is not so much "Shall we ML?", but more if the wife is in the mood, or not repulsed with the idea of some hanky panky, and maybe some LM (or not).

One thing that drives me nutty is that implicitly, if we are expected to push for it all the time and with the chance of scoring like 1 out of 20 times, the whole act of seducing becomes rather painful (and to some extent pathetic) for the Hd partner.

Also, I think it is in general a good thing if there would be more clarity. I don't want to 'bother' my wife each and every night simply to hope that 'this time I'll get some' where most of the times it might annoy her that I am 'pressing for ML all the time'. It would be so much easier if the LD partner could be more forthcoming or clear when she is willing to ML or not.

You gain 2 major advantages: 1) The HD partner doesn't run the risk of trying to seduce his/her partner all the time only to be turned down in the majority of times. (perpetual disappointment) 2) The LD partner won't feel as pressed all the time and feel overwhelmed by his/her partner's perpetual desire for sex.
It would very much remove a lot of the (killing) anxiety between the partners. It's the same principal as 'scheduling ML'.