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Responses to attitude and activity preference surveys were compared for the degrees of real and perceived similarity within,male (n = 13) and female (n = 11) friendship pairs. Activity preference similarity was substantially greater than attitudinal similarity, in fact: friends' attitudinal similarity was no greater than strangers'; individuals were able to predict the friend's responses to the activity survey more accurately than to the attitude survey; and activity similarity was a better predictor of liking than was attitudinal similarity. The findings were the same for males and females. These results suggest that the opportunity to engage in mutually pleasurable activities may be a stronger motive in friendship choice and friendship maintenance than is the satisfaction of knowing the friend agrees with you.
Werner et al. (Thu,) studied this question.