Sentence:  Biologically described as the release of seminal fluid from the penis during the male sexual response cycle, male <WSD>ejaculation</WSD> is entangled with cultural beliefs about male sexual prowess and masculine authenticity. ... Due to the sexual, cultural, and personal significance of <WSD>ejaculation</WSD>, men and boys are vulnerable to prevalent messages about the timing, size, and frequency of their <WSD>ejaculation</WSD>. <WSD>Ejaculation</WSD> can be a visual representation of the measure of the man. 
Meaning of the word marked with <WSD> tags:  A reflex in human beings and other mammals in response to sexual stimulation involving the forcible ejection from the urethra of, in males, semen; and, in females, vaginal fluid.