Tongkat Ali While on HRT?

I got a big kick out of this study:

1: Arch Pharm Res. 1998 Dec;21(6):779-81.Links
Eurycoma longifolia increases sexual motivation in sexually naive male rats.

Ang HH, Sim MK.
School of Pharmaceutical Sciences, University of Science, Malaysia, Minden, Singapore.

The aim of this study is to provide evidence on the aphrodisiac property of Eurycoma longifolia Jack. An electric grid was used as an obstruction in the electrical copulation cage in order to determine how much an aversive stimulus the sexually naive male rat for both the treated with E. longifolia Jack and control groups were willing to overcome to reach the estrous receptive female in the goal cage. The intensity of the grid current was maintained at 0.12 mA and this was the intensity in which the male rats in the control group failed to crossover to reach the goal cage. Results showed that E. longifolia Jack continued to enhance and also maintain a high level of both the total number of successful crossovers, mountings, intromissions and ejaculations during the 9-12th week observation period. In conclusion, these results further enhanced and strengthened the aphrodisiac property of E. longifolia Jack.

[quote]e-loo wrote:
I got a big kick out of this study:

1: Arch Pharm Res. 1998 Dec;21(6):779-81.Links
Eurycoma longifolia increases sexual motivation in sexually naive male rats.

Ang HH, Sim MK.
School of Pharmaceutical Sciences, University of Science, Malaysia, Minden, Singapore.

The aim of this study is to provide evidence on the aphrodisiac property of Eurycoma longifolia Jack. An electric grid was used as an obstruction in the electrical copulation cage in order to determine how much an aversive stimulus the sexually naive male rat for both the treated with E. longifolia Jack and control groups were willing to overcome to reach the estrous receptive female in the goal cage. The intensity of the grid current was maintained at 0.12 mA and this was the intensity in which the male rats in the control group failed to crossover to reach the goal cage. Results showed that E. longifolia Jack continued to enhance and also maintain a high level of both the total number of successful crossovers, mountings, intromissions and ejaculations during the 9-12th week observation period. In conclusion, these results further enhanced and strengthened the aphrodisiac property of E. longifolia Jack.
[/quote]

How can we be sure they did not bias the results by using really young, hot looking rats for the longjack group vs. “Oprah Winfrey-type” rats for the control group?