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4级硬度可以带来最好的性生活 |
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参考文献：
1. Advancing the science of Better Sex
2.
Source: Giuliano F, et al. Presented at: The 9th Congress of the European Society for Sexual Medicine; December 3-6, 2006; Vienna, Austria. Abstract MP-05-139.
3. Mulhall J et al. J Sex Med 2007:4:448-464
4. Mulhall JP. et al. UROLOGY 68 (Suppl 3A), 2006:17-25