I think it's sad that you think "most guys" would be willing to prey on women.
I don't think you should have sex because some one promises you something. Good sex isn't really a transaction...
a) the lie of "I love you" is a lie that will only work on a person who is in a vulnerable state, and screwing them over on top of that for your own selfish needs is, yes, something that a psychopath would do
that most guys would be willing to deceive a woman in one way or another in order to get her to bed is not that much of a controversial statement, I feel
c) I agree, but it is oftentimes how it goes