Answer 1
It is forbidden in Christianity although a minority of churches allow same sex marriage. This led many Christians to seek sex outside marriage when they get into problems with their licit partners.
Per Islam teachings, it is allowed for a man to marry up to four wives but subject to specific conditions that make it not so widely applied unless in a very specific cases. One of these conditions is to treat wives equally. Another condition is to seek approval of former wife (or wives) otherwise they have the right to seek divorce. One of the reasons that may justify marriage with a second wife is to have your first wife so ill that she can't perform sexual relation with her husband. Another reason may arise when a wife got widowed and has children and needs a husband to share the responsibilities of raising up her children and save her from practicing illegal sexual relationships that are strictly forbidden per Islam teachings.
Answer 2
In most Western countries, polygamy is forbidden. In several Muslim-majority countries it is permitted.
Intermarriage
To guard against commiting forbidden sex without marriage or fornication that is strictly forbidden per Islam religion.
yes, kissing between man and woman before marriage is forbidden.
Sex before marriage, abortion
If you mean by love marriage is practicing sex outside marriage (fornication) then it is strictly forbidden per Islam teachings. However, if you mean the licit marriage per Islam rules based on love (between the two partners); not sexual love; then it is not forbidden and is not gunha.
No. Same-sex marriage is explicitly forbidden by Chickasaw law.
It is not forbidden for a Muslim man to love a Christian girl but after concluding a licit marriage. Any form of dating or sexual relationships between man and woman outside marriage is forbidden per Islam religion teachings.
Sex before marriage is totally forbidden even the kiss.
She can not do hajj when her marriage is forbidden in Islam
It is bad not only for Christian but also for Muslims and Jews. This is because it forbidden in all religions to have sex without marriage.
In the U.S., it changes from state to state. Generally, homosexual and polygamist marriage are not allowed. However, in some states such as Massachusettes, gay marriage is allowed.
no, it is morally forbidden in Hinduism. But there is no law against it in Hinduism.