I think most men feel "inspired" all the time but only a few can feel the same about their long term partner and in a baby making context. Over the last couple of years we had so many arguments in bed over positions, length etc so it seems to be getting trickier and trickier to get him inspired. We still love each other and kiss and hug each other all the time, there is a lot of touching going on but not that much goes further
I think you are right arginine seems to also make erections stronger "The usual dosage of supplemental Arginine employed for the treatment of Male Infertility is 4,000 – 8,000 mg (4 – 8 grams) per day. An average dosage of Arginine for the enhancement of Sexual Performance is 5,000 mg (5 grams) taken approximately 45 minutes prior to expected sexual activity" Natural sources of arginine include nuts, gelatin, chocolate, brown rice, oatmeal, raisins, sunflower/sesame seeds, whole-wheat bread, and protein-rich foods.