What is the evaluation of sexual selection?
-used a computer programme called Faceprints to discover the importance of symmetry in attractiveness
.showed pt.'s facial images and asked to rate them on a beauty scale
.then, the pictures with the highest ratings are merged together and the less attractive photographs taken out
.each trial ends when a viewer rates the composite a perfect 10
All the perfect 10s were super symmetric
+Support for inter-sexual selection
-Clark and Hatfield (1989)-females are choosier
.male and female psychology students approached people on campus asking questions including:
'I have been noticing you around campus. I find you very attractive. Would you:
a) come over to my apartment tonight?
b) go to bed with me tonight
In line with evolutionary theory females don't want to engage in casual sex and are choosier than males when it comes to selecting a sexual partner as reproduction with poor genes can be costly
.Preference for body shape that signals fertility
.Devendra Singh (1993,2002) male preference not so much for body size but for waist-hip ratio (WHR) up to a point, males generally find any hip sizes attractive so long as ratio of one to another is 0.7
.Acts as an 'honest signal' (as hard to fake) that a woman is fertile but currently not pregnant
-Sexual selection theory is too simplistic
.Buss and Schmitt (2016) claim sexual selection theory is too simple as it suggests 1 strategy is adaptive for all females
.Instead, both have similar preferences when seeking a long term relationship (loyalty, love, kindness etc)
.This is a more complex evolutionary view it takes account of the context of reproductive behaviour
-Ignores social and cultural influences
.Partner preferences have been impacted over time by changing social norms and cultural practices
.These have occurred too fast to be down to evolution
.Wider availability of contraception & changing roles in the workplace mean women's partner prefs are no longer resource orientated
.This suggests that partner prefs today are likely to be down to both evolutionary & cultural factors which a theory such as this one is limited as fails to explain both