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Lorient continued to press, though, and managed to open the scoring just before half time when Ayew played the ball in for Raphael Guerreiro to slice in from a tight angle.
Javier Pastore tried to get the French champions back on level terms at the start of the second half, but his volley from the edge of the box was comfortably stopped.
PSG continued to press, and managed to find the equaliser when Edinson Cavani rifled the ball in from close range on the rebound, after his own shot had been parried moments earlier.
The visitors were ahead less than 10 minutes later as a through ball from Marco Verratti stretched the Lorient defence, leaving Jean-Christophe Bahebeck to slot the ball home from a tight angle.
Verratti could have added a goal of his own late on, but he mishit the ball, sending it high and wide of the Lorient goal.
The result leaves PSG second in the table, just a point off top spot, while Lorient sit 17th, just outside the relegation zone.