is it really true?

today i was chatting with my boss casually, we talk about relationship and sex.
i understand it's a rather weird topic to speak with your boss. anyway we chatted for quite a while.

he told me that guys will cheat once in their life and they can separate sex and love clearly.
they can love their wife but not having sex.
or they can have sex but do not love the person.

is it true? but how? how can u have sex with that person without loving the person? dont they feel gross of doing that with the person if you dont love them?

but i guess it's possible, because there's no love in prostitution, and it's all about sex.

I'd said i respect those gals, because they are doing it to earn money and to support themselves, i personally dont think i can do it.
I'm a person rather emotional, i do thing according to feelings.
I can't do it without love or feelings....

What about you?