Meanwhile, 30 percent are open to same-sex marriages in their country, according to the survey by pollster CBOS.
The study also found that 40 percent of Poles believe that abortion should in general be prohibited, while 29 percent think it should be allowed by law, the pollster said.
At the same time, 67 percent of those polled were positive about sex education classes in schools, while 19 percent described themselves as opponents of sex ed.
The poll findings were released as Poland counts down to a parliamentary election.
The leader of the country’s ruling conservatives, Jarosław Kaczyński, this week reiterated his Law and Justice (PiS) party's strong opposition to gay marriages and adoption of children by gay couples.
Several hundred parents in March staged a protest in Warsaw against a pro-LGBT move by the city’s mayor amid a row over suggestions that gay couples in Poland should be allowed to marry and adopt children.