Effects of Everyday Romantic Goal Pursuit on Women's Attitudes Toward Math and Science. 
-- L. E. Park, A. F. Young, J. D. Troisi, R. T. Pinkus. Personality and Social Psychology Bulletin, 2011; 37 (9).

On days when women pursued romantic goals, the more romantic activities they engaged in and the more desirable they felt, but the fewer math activities they engaged in.