1 Using the trans-membrane migration method to measure drug effects on human sperm motility, it is found that delta-9-tetrahydrocannabinol is the major constituent of cannabis which inhibits sperm motility and unlike the cataleptic effect, other constituents in the petroleum spirit extract do not potentiate this effect significantly. 2 It is suggested that the mechanisms for sperm immobilization and cataleptic effects are different.
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Hong et al. (1982) studied this question.
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