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1 Penis size in Asia

2 Violence as political tool

3 The necessity, and benefits, of destruction

4 Policies for a society of greater sexual freedom

5 Who is against drugs?

6 An alternative legal theory

7 Regulating the media

8 A materialistic perspective

9 Maximizing sexual experience

Reference:

1 Boolell M, Allen MJ, Ballard SA, Gepi-Attee S, Muirhead GJ, Naylor AM, Osterloh IH, Gingell C, Sildenafil: an orally active type 5 cyclic GMP-specific phosphodiesterase inhibitor for the treatment of penile erectile dysfunction., International Journal of Impotence Research [1996, 8(2):47-52]

2 Jonathan P. Jarow, Arthur L. Burnett, Alan M. Geringer, Clinical efficacy of sildenafil citrate based on etiology and respone to prior treatment, The Journal of Urology Volume 162, Issue 3, Part 1, Pages 722-725

3 Giorgio Gabella, Autonomic Nervous System, Wiley Online Library