Introduction The objective of this study is to determine whether there is any relationship between erectile function (EF) and ejaculatory function (EJF), with the aim of improving care protocols in the clinical practice. Materials and methods A total of 1004 Czech males between 15 and 84 years (42.77 ± 17.556 years) completed a sexual behavior questionnaire. A correlational, between-subjects design was used, where a 5-item abbreviated form of the International Index of Erectile Function (IIEF-5) was used to measure EF, which produces a value between 5 and 25. Values greater than 21 are considered as a normal function. EJF was measured using the Index of Premature Ejaculation (IPE). IPE has three domains (Control, Satisfaction and Distress) with scores from 0 to 100, higher ones are associated with a greater control and satisfaction, and lower anxiety, all related to the perception of ejaculation. A linear regression analysis was performed and a statistics model was proposed for each domain with EF as a dependent variable and the specific EF domain as a predictor. The Pearson correlation coefficient was also calculated for these variables. Results EF scale mean value was 19,44 ± 2,368, control domain mean value was 80,98 ± 18,032; sexual satisfaction domain mean value was 78,07 ± 21,454; and distress domain mean value was 74,85 ± 34,498. The results indicate that all linear regression models between EF and each of the domain of EJF and the Pearson coefficients (r) are statistically significant (p<0.05). Control r=0,478, p=.001, Satisfaction r=0,405, p=.001 and Distress r=0,324, p=.002. Conclusions Higher levels of EF are associated with a better control and sexual satisfaction, and less distress about ejaculation. This link should be considered for developing new clinical practice guidelines for erectile dysfunction and premature ejaculation.