Silvia Azaña, an embryologist at inviTRA, explain in this video whether the volume of ejaculate is always the same:
No. Although very noticeable differences are not perceived, the same amount of semen is not expelled in every ejaculation. For example, the previous days of sexual abstinence can influence the final semen volume.
Read the full article on: What Is the Normal Semen Volume in Males? ( 85).

Silvia Azaña Gutiérrez
B.Sc., M.Sc.
Graduate in Health Biology from the University of Alcalá and specialized in Clinical Genetics from the same university. Master in Assisted Reproduction by the University of Valencia in collaboration with IVI clinics.
License: 3435-CV