1 Sentences With "became upright"

How to use became upright in a sentence? Find typical usage patterns (collocations)/phrases/context for "became upright" and check conjugation/comparative form for "became upright". Mastering all the usages of "became upright" from sentence examples published by news publications.

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Breasts, and especially nipples, are highly erogenous zones, for both men and women. Nipple and breast stimulation of women are a near-universal aspect of human sexuality, though nipples in males are not as sexualized. Humans are the only primates whose female members have permanently enlarged breasts after the onset of puberty; the breasts of other primate species are enlarged only during pregnancy and nursing. One hypothesis postulates that the breasts grew as a frontal counterpart to the buttocks as primates became upright to attracting mates, a model first developed in 1967.