Thank you. Now I don’t feel so naive for having listed reasons for marriage other than love. I myself do not consider love a prerequisite for marriage.
If you were a soul-mate type of friend where you can tell them anything and everything then I think it can work because you would love that person as a person and it can even be the unconditional type of love that one would associate with a partner or child but not necessarily the Eros type of love that one might insist upon when younger.
On the other hand I also find seeing an older couple who are obviously in love and still desire each other after 20 or 30 or even 40 years together I find much more erotic that seeing a couple in their teen or twenties all over each other. That certain look that the older couple give each other accompanied with a squeeze of the hand or peck on the cheek can convey so much more and is often done unconsciously and without any embarrassment.