I think that there are 2 important points here.
1. Escorts are human beings too. They need love, attention and affection just like anyone else.
2. I would guess that for an escort, sex with a paying client is very different to sex with a boyfriend, just like it is for a lot of clients. Sex for me with a girlfriend is completely different to sex with an escort. They satisfy 2 completely seperate urges, which is why I never see escorts when I am in a relationship.
Anything's a dildo if you're brave enough.