For the benefit of people following this thread who are unaware of the context of this claim, Crowley was making a vieled reference to sex magic. Specifically, 150 ejaculations that did not result in a child being conceived. The metaphor was used as it was unacceptable in Victorian time to publish a discourse on masturbation, though acceptable to sacrifice children
At the request of a colleage he included a lengthy disclaimer, warning about literal interpretation of the chapter this claim appeared in. None the less people frequently quote it literally and hysterically.
In Australia recently it has been a legal battle in the courts. Some people are still ignorantly promoting this as a literal fact, which has been judged as religious vilification. Some details may be seen on the local OTO website.
http://www.otoaustralia.org.au/main.htm Click the link for press releases.