Transferred from the ejaculatory bulbs of males to the female genitals upon copulation, plays an important role in the reproductive biology. a carboxylic ester + H2O = a carboxylate + an alcohol + H(+) Monomer. Specifically expressed in the ejaculatory bulbs of male. In the male, it appears 3 days after emergence in the imago stage and reaches maximum levels by the 10th day. Belongs to the type-B carboxylesterase/lipase family.