A lawyer who “manipulated his attorney-client relationship” with a woman to facilitate inappropriate sexual communications with her 14-year-old daughter will lose his law license for three years, the Pennsylvania Supreme Court ordered May 9.

The discipline proceedings against the lawyer, Jeffrey T. Toman, highlights variations in the way states discipline attorneys who are convicted of sex crimes involving minors.

Toman pleaded no contest in 2017 to “corruption of minors,” a first-degree misdemeanor, after an investigation into his contact with the...