I loved this question - entirely valid and entirely charming. I can tell you for a fact that semen doesn't make breasts bigger, because as said above it doesn't contain any neccessary hormones, any hormon content is androgen, and on the grounds of nutrition, it's about the same a tiny bite of cereal bar per mouthful, which definitely hasn;t enough to make breasts grow in itself! When swallowed but it definitely does make the skin more glowy, cannot argue with that! Also, there's a lot of evidence to suggest the hormones that are in cum have mood elevating effects. Still a lot of reasons for swallow not spit I'd say!