Are we talking about the same Bono that gave a girl in the audience a lap dance on SNL? Yeah, he would NEVER allude to anything sexual in his music.
from Mother Jones Magazine, 1989:
MJ: What do you think of Prince's brand of salacious Christianity, which says that brilliant sex lights the way to paradise?
Bono: I just believe that Prince believes the same thing I do: that God is sex as well as love.
MJ: So you feel, when you listen to a Prince album, that you guys are singing the same gospel?
Bono: I feel very close to Prince, closer than you might think.
MJ: Closer than I would think, in that he's considered sex-crazed, while critics regularly describe U2 as nearly sexless.
Bono: I'm deeply insulted to hear you say that, and shocked, and mesmerized. I don't think they could have been to too many U2 shows. You'd have to ask our audience. This may be one of those cliches from the critical community who generally themselves are completely sexless. You can't fuck people with your head, or maybe you can....
MJ: Now, come on. You honestly think that the kind of really erotic sounds that you hear in "Sexual Healing" or "Little Red Corvette," that there are U2 songs that have that kind of carnal energy?
Bono: No. Yes, I think there is a sexuality to U2. I don't think it's dressed up in leather, or high-heel boots, or that type of thing.
I don't think it's the sort of peek-a-boo-type sexuality. So, some people, who have to have a neon sign that says sex before they see sex, may not see it in our music. But sex is a much subtler thing than that. Today you'll find the exact same girl in the Coca-Cola ads and the rock videos. That's not rebellious anymore. It sells products. And it is a product. That kind of overt or camped-up sexuality is no longer rebellious in the way that it was in the '50s and '60s, when people weren't owning up that they even had a sex life. People needed that shoved in their face and rock 'n' roll was a great medium to do it. But that doesn't apply now...
See, most things that a lot of people find sexy, I find incredibly funny! I don't find the things I see out on the Strip, say, latex trousers, turn me on. They just don't.