Relationships get comfortable, we all know that. That's why there are stages.

Most men get the girl they want with effort and most importantly making her feel special: Date nights, compliments, communication, attention, being loving, etc. As the relationship progresses majority of men do not keep up with these things as they already got what they wanted (duh) so don't feel the need to.

Many woman crave connection from their partner. Especially an emotional connection, this is kept up by men showing her she is important, putting in effort this will ensure she will do her part maintaining the relationship. In turn it will want the woman to be closer to her partner emotionally and physically Women are not sexually turned on from taking care of an adult child, a man that takes her for granted or makes her feel under appreciated. So sex will die if she is feeling unfulfilled by this.

I can already hear it "why do women think it's a mans job to keep her emotionally satisfied? It's real life and women should know it's not a fantasy - there will be times attention won't be solely on her. So a woman wants a man to be the head of household, share duties and also cater to her narsasstic personality?"

So if you feel it's normal to go months and months without keeping up with what you did in the beginning - why do you expect women to give you sex like it was in the beginning as well ?