We know estrogen plays an important part in libido, so if there's reports of libido increase it could be because that estrogen(effect) was needed.

Granted all other factors would have to be known: baseline hormones, supplementation, diet, stress factors.

I'd guess that while the grapefruit may be the contributing factor, its probably one of the multiple hormone conversions from the dhea isomers.

I recently found that epiandrosterone+Dermacrine had little effect on my libido/erection quality; positive or negative. I'm currently chucking it up to a possible hormone imbalance. Partly due to what I believe may be too high libido.

Best of luck with the cycle, and I'm sure all will be fine once you come off. Run a proper PCT and be safe homie.