for me the vasectomy v tubal ligation argument would be simply the op & recovery time. for men it's a cheaper, faster, less complicated and lower risk op.In a lot of couples that's true - I'd go so far as to say the majority. There are exceptions, though. One thing I can't fault my ex on was dedication to contraception. Also - I think there is more of a balance in who is considered responsible for contraception in a relationship that has already produced children. In fact in my experience the imbalance swings the other way - an awful lot of women expect a man to have a vasectomy after that relationship has produced the number of children she wants. These same women won't consider tubal ligation giving their reason as being 'what if I want another child'. Huh?
I know the reverse can happen too, but of the 'committed with kids' couples I know (of various ages) who I have discussed this with there is a definite imbalance of the women keeping their fertility and men being expected to give theirs up.
and the risk of ectopic pregnancy, which is potentially fatal and extremely painful, is increased with ligation and removed with vasectomy.
my aunt had more than one ectopic after and, having seen the state it left her in, quite frankly it scares the shit out of me. eventually her insides were so screwed up they just gave her a full hysterectomy.
...i don't mean to be all scare mongery. it's a small risk and it's just my personal experience that makes it seem bigger to me.
my ex, having seen the delightful personality changes induced by the pill, never once complained about rubbering up throughout our relationship.