Fast weight gain from having sex

Iyana • 💁🏽 Lipstick addict 💋💄 Add me on Snapchat @ pretty_giaaa 👻
On June 16th of last year (which is my birthday) I had lost my virginity to my boyfriend (which is now my ex) and ever since then, we would have sex constantly. Anyways, before June 16th, I was 110 pounds and now I'm 145 pounds. I heard that sex can make you burn calories but can it also make you gain weight? 
P.S., I'm not worried, I'm thicker now 😛💁🏽
but I'm just curious and I want these other people's opinions. 
Edit: We always used condoms