"When actually faced with a potential date, we don't like to reject a person and make them feel bad, which is not necessarily something that people anticipate when they imagine making these choices," said the study's lead researcher Samantha Joel at the University of Toronto.
"The fact that we underestimate how concerned we'll feel about hurting the other person's feelings may help to explain why people's dating decisions often don't match up with their stated dating preferences," said Joel, psychology PhD candidate.
Participants were split into real and hypothetical situations. Those in the real situation were told that the potential dates were in the lab next door and could meet them.
Those in the hypothetical situation were told that the potential dates were unavailable, but to imagine the possibility of meeting them.
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Participants selected their favourite profile of the three. They were then given additional information about the potential date - including a photo of an unattractive person, and a completed questionnaire that suggested the potential date wanted to meet them.
The researchers found that those in the real situation were more likely to accept the date from the unattractive suitor. When asked, the participants said they were concerned about hurting the potential dates' feelings.
In the second part of the study, the researchers surveyed participants' willingness to accept dates with individuals whose qualities or attributes were undesirable because of habits or traits, rather than physical unattractiveness.
They then filled out the same questionnaire and were told it would be presented to the potential date. Again, those in the hypothetical situation were more likely to reject the dates than those considering a face-to-face proposition.
"I think it's incredible that people care so much about not hurting the feelings of potential dates who they haven't even met if they think they'll actually meet them," said Joel.
The study was published in the journal Psychological Science.