couple things:
first, from my understanding, it's highly unlikely to get a girl pregnant while on...European countries, from what i've "heard", use testosterone supplemenatation for HRT, but also as a birth-control method for men
*looked around a bit*
Stereological Evaluation of Human Spermatogenesis after Suppression by Testosterone Treatment: Heterogeneous Pattern of Spermatogenic Impairment1
Yang Zhengwei, Nigel G. Wreford, Peter Royce, David M. de Kretser and Robert I. McLachlan
Prince Henry’s Institute of Medical Research (Y.Z., R.I.M.) and the Institute of Reproduction and Development (N.G.W., D.M.d.K.), Monash Medical Center, and the Department of Anatomy, Monash University (N.G.W.), Clayton, Victoria 3168; and the Department of Surgery, Monash University, Inner and Eastern Health Care Group, Alfred Hospital (P.R.), Prahran 3181, Australia
Address all correspondence and requests for reprints to: Dr. R. I. McLachlan, Prince Henry’s Institute of Medical Research, P.O. Box 5152, Clayton, Victoria 3168, Australia. E-mail:
[email protected].
Abstract
Testosterone (T) treatment suppresses gonadotropin levels in normal men and is a promising reversible contraceptive that induces azoospermia in approximately 70% of subjects and oligospermia in the remainder; however, the basis of this variable response is unclear. This study aimed to investigate this reported variable response by examining the spermatogenic process and quantitating germ cell number in men after T-induced gonadotropin withdrawal. Ten normal fertile men (31–46 yr), already planning to undergo vasectomy, either received T enanthate (200 mg, im, weekly) for 19–24 weeks (n = 5; TE group) or proceeded directly to surgery (n = 5; controls), at which time a unilateral testicular biopsy was taken, and germ cell numbers were estimated using the optical disector stereological method. In response to TE treatment, serum T levels rose 2-fold, and FSH/LH levels became undetectable. Sperm counts fell to azoospermia in 4 men and to 21 million/mL in the fifth man. The mean number of type A spermatogonia per 100 Sertoli cells was unchanged, but type B spermatogonia fell markedly to 10% of the control values, and later germ cell types decreased to 11–18% of the control values. The pattern of germ cell suppression varied widely and showed no relationship with sperm count or the time to azoospermia. Despite the presence of elongated spermatids (1.4–20% of the control), four men remained azoospermic. Two TE subjects with similar early germ cell complements and elongated spermatid numbers had sperm counts of zero and 21 million/mL; the latter man demonstrated marked variability in germ cell numbers between adjacent tubules. We conclude that 1) the principal spermatogenic lesion in TE-treated men is the marked (90%) inhibition of type AB spermatogonial maturation. Other sites are also affected, particularly the release and/or survival of elongated spermatids during transit; and 2) a steady state in germ cell number may not be established even after 4–5 months of TE treatment.
The findings suggest that TE treatment does not adequately or consistently withdraw hormonal support for spermatogenesis, leading to variable between- and within-individual patterns of germ cell suppression.
secondly, i've never seen any documented evidence supporting the claim that you will have retarted, ten-legged children if you get a girl pregnant while "on"...
*more poking around*
Pregnancies associated with sperm concentrations below 10 million/ml in clinical studies of a potential male contraceptive method, monthly depot medroxyprogesterone acetate and testosterone esters.
Barfield A, Melo J, Coutinho E, Alvarez-Sanchez F, Faundes A, Brache V, Leon P, Frick J, Bartsch G, Weiske WH, Brenner P, Mishell D Jr, Bernstein G, Ortiz A.
A potential male contraceptive approach was evaluated in clinical trials involving monthly injections of depot medroxyprogesterone acetate and either subdermal implants of testosterone propionate or monthly injections of testosterone enanthate. Pregnancies occurred in partners of 9 men with recent sperm counts of 10 million/ml or below. In 5 of the 9 instances, the sperm counts were less than 1 million/ml. It appears that male contraceptive methods involving spermatogenic suppression may require attainment and maintenance of azoospermia. The pregnancy rate cannot be calculated, because the extent of other contraceptive use is uncertain.
There were no spontaneous abortions. 6 pregnancies were carried to term, and all progeny were normal, based on physical examination at birth or 3 months after birth.
i've seen Arnold's kids, and Hogan's, and they look fine to me...however, i would also say it's not worth the risk, and would simply give it as much time "off" as you can possibly stand, which in this case, since you're talking about another life, should be as long as necessary. someone else probably mentioned speaking with a doctor on this issue...sounds good to me.
alpha
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Originally Posted by gsxxr
hehehehe....so between the studies you quoted and my certitude that they are mine, i go for the latter 
