'No I'm not. Some contracts require something in writing. It doesn't mean I don't consent to sell you my house, just that a higher level is required for that transaction. Sex requires a clear yes. A simple lack of a no isn't consent.'
'I have seen a really pretty diamond ring, I know it is quite expensive but it would be a mark of your respect for me'
'hmm, I am not sure I am comfortable with spending that much'
'please please, I would be so happy'
And so it goes on until, one day, the man decides it is just easier to buy the ring and he gives it to his gf for her birthday.
Is that theft? She has taken a ring off him that he has not 'enthusiastically given.
That is the implication of 'enthusiastic' consent, although I know that many here will say there is no analogy for sex (I would disagree, sex does not operate sui generis, unrelated to any other transaction between human beings).
And, no, your ad hominem attack leaves me very cold, despite the fact that it is against the site rules and common decency. I have never had sex with anyone who has not 'enthusiastically' consented. It does not mean I cannot see many flaws in the argument; it is possible to actually think outside one's own experience.