Scientists are genuinely divided on this question.

Not medical advice — just what the research says.

What's still open

What the evidence found 3 findings
Based on 13 sources:
CNN News news View
Scientific American news View
New Atlas news View
PMC Article on CASA validity and reliability peer-reviewed View
National Journal of Physiology, Pharmacy and Pharmacology peer-reviewed View
PubMed indexed study peer-reviewed View
PubMed validation study peer-reviewed View
PubMed peer-reviewed View
ResearchGate peer-reviewed View
Men's Reproductive Health blog View
Standardized Methods for Semen Evaluation in a Multicenter Research Study peer-reviewed View
WHO Laboratory Manual for the Examination and Processing of Human Semen institutional View
Computer-assisted sperm analysis in mice – a literature review institutional View
Based on 14 sources:
PMC peer-reviewed View
PMC peer-reviewed View
BC Medical Journal peer-reviewed View
PMC systematic review and meta-analysis peer-reviewed View
Science Direct fertility study peer-reviewed View
PMC sperm parameters study peer-reviewed View
Hera Fertility blog View
medRxiv peer-reviewed View
PMC peer-reviewed View
PMC peer-reviewed View
PubMed peer-reviewed View
UroToday institutional View
PMC - NIH peer-reviewed View
Facebook post blog View
Based on 14 sources:
ResearchGate peer-reviewed View
PMC peer-reviewed View
National Council on Disability institutional View
PubMed peer-reviewed View
PMC peer-reviewed View
BC Medical Journal peer-reviewed View
PMC peer-reviewed View
Physiological Reviews peer-reviewed View
Frontiers in Public Health peer-reviewed View
PMC - NIH peer-reviewed View
News Medical news View
ResearchGate peer-reviewed View
Andrology Journal peer-reviewed View
Scientific American news View
What research hasn't answered 3 gaps
ResearchGate peer-reviewed View
PMC peer-reviewed View
National Council on Disability institutional View
PubMed peer-reviewed View
PMC peer-reviewed View
Sources 19 findings
argumentation Unknown
argumentation Unknown
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
2017 Levine argumentation
tree-leaf argumentation
argumentation Unknown
argumentation Unknown
Push back on this read

Think the evidence is read wrong? Present your counter-evidence and we'll evaluate it against the 44 sources behind this analysis.

Related questions
Is any amount of alcohol safe? Are multivitamins a waste of money? Is psilocybin better than antidepressants? Does eating late at night cause weight gain?

Heard something that sounds off?

Generated by reaso.ai's editorial pipeline: claim restated, scientific consensus classified via 3-run majority vote, 19 findings enriched with attribution and study type, narrative written in neutral voice. No individual researcher has signed off on this specific analysis — see methodology for how the pipeline works. Built with Claude Sonnet by Anthropic. Updated April 16, 2026. How we do this →

Written by AI. Sources are linked for verification.