Haley Kalil says sex with her NFL ex-husband Matt Kalil was damn near impossible because of his oversized manhood ... but a renowned sex therapist is explaining how they could have made things work in the bedroom, and she's got pointers for other couples going through the same issue.

Here's the deal ... Haley went on a podcast recently and revealed the biggest reason for her divorce from the former NFL offensive lineman was the fact that sex was difficult because his penis was the size of two Coke cans. Getty

Dr. Laura Berman listened to Haley's complaints and tells TMZ ... the SI Swimsuit model is far from alone in finding it difficult to bang a partner who is oversized.

While the good doc stresses bigger is not always better, she says there are plenty of ways for women t

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