TweetSexual benefits:

Penile Tumescence

L-DOPA administration at 800mg daily for 7 days in healthy men (no complaints of penile problems) is associated increased penis tumescence (thickness from bloodflow); however, its effects were most significant when serum testosterone was greater than 17.5pg/mL suggesting the effect is androgen-dependent.[17] In youth (20-30) it also increased maximum penile girth.[17] This effect may be mediated through dopamine receptor agonism.[18]

Libido

Interestingly, with Levodopa therapy in Parkinson's Disease a possible side-effect is Hypersexuality associated with excessive dopaminergic firing via dopaminergic agonism.[19] It is more commonly associated with chemical dopamine agonists rather than levodopa, however. It is one of the many side effects associated with compulsivity from dopamine agonism, just the sexual manifestation.[19][20]

In healthy men and women, 100mg single administration of L-DOPA was able to augment magnitude of T-reflex (used to measure physical responses to orgasm) in men, although 100mg L-DOPA was ineffective at increasing libido or sexual arousal;[21] possibly related to dopamine's role in the energetic aspects of motivated behaviour,[22] by acting on the oxytocinergic neurons in the PVN of the hypothalamus.[23] 3 men reported penile erection during the control (non-sexual) film used, an amusing side-effect.