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Libido in its common usage means sexual desire; however, more technical definitions, such as those found in the work of Carl Jung, are more general, referring to libido as the free creative—or psychic—energy an individual has to put toward personal development or individuation.
Sometimes sexual desire can be impaired or reduced. It also may be weak or not be present at all, in occurrences such as asexuality. Factors of reduced libido can be both psychological and physical. Absence of libido may or may not correlate with infertility or impotence.

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Libido Research
Breeding soundness and libido examination of Belgian Blue and Holstein Friesian artificial insemination bulls in Belgium and The Netherlands
Data on breeding soundness and libido evaluations in Belgian Blue (BB) bulls are scarce. The present study compared results of breeding soundness and libido evaluations of young BB bulls to young Holstein Friesian (HF) bulls prior to acceptance into an AI program. Breed differences for breeding soundness exist between BB and HF bulls, as 93.7% of the young BB bulls failed the breeding soundness examination (BSE) compared to 59.3% of the HF bulls (P = 0.0005). Within the BB breed, differences were present between bulls of different ages, and bull selection for better fertility with increasing age apparently influenced the results. The number of reasons for which bulls failed the test differed between the age groups in the BB breed, whereas a tendency for more failure reasons in the BB breed was noticed in the breed comparison. The most important reasons for failure were sperm morphology and scrotal circumference (SC), but far more BB bulls failed for these traits compared to the HF breed (82.8% versus 56.0% and 43.8% versus 17.6% in the BB and the HF breed for sperm morphology (P = 0.0005) and SC (P < 0.0001), respectively). The high proportion of BB bulls with a substandard SC and poor sperm morphology might suggest an increased prevalence of testicular hypoplasia or degeneration within this breed. Concerning libido, the reaction time did not differ either between breeds or between age groups within the BB breed, whereas mounting enthusiasm, although not different between the two breeds, did decline with increasing age, probably due to the greater mating experience of the older bulls. All in all, libido did not seem to be different between the breeds.
Keywords: Breeding soundness; Libido; Belgian Blue; Holstein Friesian; Bull

Libido and orgasm in middle-aged woman
Objectives: Determine which social, demographic and sexual function variables that most influence libido or desire and orgasm domains in the premenopausal and postmenopausal women.
Methods: A cross-sectional analysis of 231 Colombian-born women, aged 40–62 years. The sexual function was measured by self-questionnaire. The analysis was performed by using the χ2-test and multivariate regression analysis. The sexual function was divided in five domains: desire, arousal, lubrication, orgasm, pain; additionally satisfaction was included.
Results: The women with a higher level of education and with a good perception of their satisfaction with their partners, reported better performance in the desire. Age and the non existence of sexual partner influenced in a negative way on the desire. In sexual active women the orgasm was negatively influenced by low satisfaction scores, lack of emotional closeness with their partners and low educational level. High scores in lubrication and desire were associated with a good performance in the orgasm. The hormone therapy (HT) was associated with better scores in orgasm.
Conclusions: Age, level of education, the presence or lack of sexual partner, degree of satisfaction with emotional closeness with the partner and adequate lubrication, influence the desire and orgasm domains in a significant way. By identifying these associations we can then perform some inexpensive interventions. Improving lubrication for menopausal women. Including men in educational activities to sensitize them toward women's feelings. Organizing educational campaigns for middle-aged women to demystify that sexuality is only for young people.
Keywords: Libido; Orgasm; Middle-aged; Sexual function; Sexual desire

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