I can see by your face you would be unfaithful.

Yes, you are actually able to tell if someone is likely to be unfaithful to you by looking at their faces. The study below shows that Men with Masculine faces and women with highly attractiveness are not only perceived as being more likely to be unfaithful but are more unfaithful. In addition, it shows that woman prefer more androgynous looking men because they are more likely to be faithful. That explains my teen age crushes on Davey Jone and David Cassidy.
Original Article
Facial correlates of sociosexuality
Lynda G. Boothroyda,b,⁎, Benedict C. Jonesa,c, D. Michael Burta,b,
Lisa M. DeBruinec, David I. Perretta
aSchool of Psychology, University of St Andrews, Fife, Scotland, UK
bDepartment of Psychology, University of Durham, Durham, England, UK
cSchool of Psychology, University of Aberdeen, Aberdeen, Scotland, UK
Initial receipt 14 August 2007; final revision received 28 December 2007
Previous studies have documented variation in sexual behaviour between individuals leading to the notion of ‘restricted’ individuals
(i.e., people who prefer long-term relationships) and ‘unrestricted’ individuals (i.e., people who are open to short-term relationships). This
distinction is often referred to as sociosexual orientation. Observers have been previously found to distinguish sociosexuality from video
footage of individuals, although the specific cues used have not been identified. Here we assessed the ability of observers to judge sexual
strategy based specifically on cues in both facial composites and real faces. We also assessed how observers' perceptions of the
masculinity/femininity and attractiveness of faces relate to the sociosexual orientation of the pictured individuals. Observers were
generally able to identify restricted vs. unrestricted individuals from cues in both composites and real faces. Unrestricted sociosexuality
was generally associated with greater attractiveness in female composites and real female faces and greater masculinity in male
composites. Although male observers did not generally associate sociosexuality with male attractiveness, female observers generally
preferred more restricted males' faces (i.e., those with relatively strong preferences for long-term relationships). Collectively, our results
support previous findings that androgenisation in men is related to less restricted sexual behaviour and suggest that women are averse to
unrestricted men.
© 2008 Published by Elsevier Inc.
Keywords: Sexual strategy; Sociosexuality; Masculinity; Attraction; Faces