Although there is a lot of controversy over this, the answer is yes, it's possible. It doesn't always happen, but since we can't measure our bodies to see how well it's coping with Lyme, there is never a good reason to risk it.
Where the real issue lies is whether or not the bacteria that is passed can be 'reactivated' to produce an active Lyme infection in others - and no studies have been done on this, simply because it's hard to imagine there would be many human volunteers. No studies have been done on animals either, could it be because they are "concerned" with what it may reveal??? We don't know, all we know is that this, as well as other studies are not being done.
Here are the studies/articles that back up sexual transmission:
www.prweb.com/releases/2014/01/prweb11506441.htmwww.treatlyme.net/treat-lyme-book/can-lyme-be-sexually-transmitted-yes//www.survivingmold.com/community/health-hype-on-sexually-transmitted-lyme-diseasewww.samento.com.ec/sciencelib/4lyme/recoveryoflyme.html/goo.gl/9JEVNf/sites.google.com/site/drjoneskids/transmission-methods