@Tes yeux noirs,
Let me add to this - herbal Viagra is unregulated and is what Lamar Odom is fighting for his life about.
This guy should go to a doctor for this issue.
In a truly intimate situation, the subject can be broached. But I do understand if it's kind of at the start of all of it.
I would not fake it. But you can be a bit assertive or at least mention what you'd like.
"Dave (or whatever his name is), I love it when we kiss. And I am really, really attracted to you. Do you want to take it further?" Assuming he says he does, then broach the subject with confidence.