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: When the [[male]] is ready to have [[intercourse]] the [[penis]] fills with blood and becomes erect.
: During [[intercourse]] [[semen]] comes out of the [[penis]] in a process called [[ejaculation]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Penis, page 168, GCSE Biology; Third Edition, Oxford University Press, AQA '']