My LLnurse prac. thinks it can be transmitted sexually. Both me & my hubby have it. When I found out I had it(6 weeks ago), I said "thanks for the Lyme, honey". Now,our dr. thinks my Lyme goes back further than my hubby's--probably at least 8 yrs ago, b/c of some major mental symptoms I had then. So, maybe I gave it to my hubby---who knows...
Also, we used to camp,& we now have a cabin on a lake in the woods, so when couples "travel in the same circles", it's not uncommon for both to get it.