My wife (30F) and I (29M) have a pretty okay sex life for what we have - we still have young kids in bed with us at night so we have sex usually once a week during the day when the kids are gone. This works great for my wife who has a lower libido than me, but I still need some supplementation during the week.

My wife happily gives me hand jobs as needed ( I usually ask 1-2 times a week) but I also masturbate 1-2 times a day myself.

When I masturbate, or my wife is giving me a handjob, I can last several minutes and the orgasm is very intense.

When I am having sex with my wife, I cum after a few thrusts with a very weak orgasm and quickly lose my erection.

How can I have stronger orgasms and last longer when having penetrative sex with my wife?