And this is the very truth. I have experienced many girlfriend's that realised in a single moment that they gave themselves over to their lover so much that they have completely forgotten about me, until the dust has settled. I have never known a girlfriend to either regret it or feel guilty for being lost in the moment. I have had some admit much later that I they said it wasn't so intense to spare my feelings but really it set their world on fire at the time. I had one girlfriend in particular find the experience so good that she continued having a year long affair without me included at all and found it sexually liberating from her daily life to fuck and be completely fucked.
It's all about sperm competition for us married men. Even though we know we can't compete, we feel compelled to try to get all of the foreign sperm out of her and reclaim her but it's an impossible mission of course. It's a very deep seated compulsion for us. It makes us lover our wives more.