They're calm, collected and in charge. Lawyers like me have power in relation to divorce clients like you. We can abuse you. Don't let us. The romantic feelings you may have for your lawyer cannot be real.
Consent requires both the right to say no and the power to say no.
It requires roughly equal power. Your power is nowhere near that of your lawyer. Because of this, there is no way you can give meaningful consent to a sexual relationship with your lawyer. Any sexual relationship between a divorce lawyer and his or her current client is not love. Any sexual relationship between a divorce lawyer and his or her client is, purely and simply, sexual abuse.