Jennifer: It could be the weather. I do hate the heat and it does make closeness a problem for me at this time of year. There is no one new in the house (if there were, I'd want to know how they got in... we own this house and don't intend to rent to anyone else). Tiredness is possible... though I'd give this more credence if I was actually doing much physical during the day (I really need a job if only to get me out of the house more!) and it could also be lack of work stress...
Serviam: Yes, been through the drugs route before (I get 'em free, hee hee) but they were wierd for me. Viagra worked but not very well in that I would not get an erection at all until the next morning. Nurse did suggest Cialis as a better option (apparently it gives the ability to have an erection for a longer period than viagra) the last time but I have not bothered to try it yet as I do not think it is solvable by drugs.
An update: this weekend things worked fine., So I think it is just the weekday evening rut thing. So I need to think of ways to prevent that...