Aside from agreeing with LMo, I'd talk to your doctor about a drug called cyproheptidine, which can mitigate the anorgasmia caused by SSRIs like Lexapro. It's an old anti-histimine that blocks the effects of the SSRI long enough for an orgasm, although it doesn't work for everyone.

But the sad truth is that intercourse is usually the least likely method to bring on a female orgasm. Seems like bad planning, huh? You might talk to your doctor, or talk to your husband and see if he'd be willing to see a sex therapist with you a few times.

I'm sorry you're not enjoying it, and hope things get better.